lib/asn1/fuzzer.c

   1 /*
   2  * Copyright (c) 2009 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Portions Copyright (c) 2009 - 2010 Apple Inc. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "der_locl.h"
  37 #include <com_err.h>
  38
  39 enum trigger_method { FOFF, FRANDOM, FLINEAR, FLINEAR_SIZE };
  40
  41 #ifdef ASN1_FUZZER
  42 static enum trigger_method method = FOFF;
  43
  44 /* FLINEAR */
  45 static unsigned long fnum, fcur, fsize;
  46 #endif
  47
  48 int
  49 asn1_fuzzer_method(const char *mode)
  50 {
  51 #ifdef ASN1_FUZZER
  52     if (mode == NULL || strcasecmp(mode, "off") == 0) {
  53         method = FOFF;
  54     } else if (strcasecmp(mode, "random") == 0) {
  55         method = FRANDOM;
  56     } else if (strcasecmp(mode, "linear") == 0) {
  57         method = FLINEAR;
  58     } else if (strcasecmp(mode, "linear-size") == 0) {
  59         method = FLINEAR_SIZE;
  60     } else
  61         return 1;
  62     return 0;
  63 #else
  64     return 1;
  65 #endif
  66 }
  67
  68 void
  69 asn1_fuzzer_reset(void)
  70 {
  71 #ifdef ASN1_FUZZER
  72     fcur = 0;
  73     fsize = 0;
  74     fnum = 0;
  75 #endif
  76 }
  77
  78 void
  79 asn1_fuzzer_next(void)
  80 {
  81 #ifdef ASN1_FUZZER
  82     fcur = 0;
  83     fsize = 0;
  84     fnum++;
  85 #endif
  86 }
  87
  88 int
  89 asn1_fuzzer_done(void)
  90 {
  91 #ifndef ASN1_FUZZER
  92     abort();
  93 #else
  94     /* since code paths */
  95     return (fnum > 10000);
  96 #endif
  97 }
  98
  99 #ifdef ASN1_FUZZER
 100
 101 static int
 102 fuzzer_trigger(unsigned int chance)
 103 {
 104     switch(method) {
 105     case FOFF:
 106         return 0;
 107     case FRANDOM:
 108         if ((rk_random() % chance) != 1)
 109             return 0;
 110         return 1;
 111     case FLINEAR:
 112         if (fnum == fcur++)
 113             return 1;
 114         return 0;
 115     case FLINEAR_SIZE:
 116         return 0;
 117     }
 118     return 0;
 119 }
 120
 121 static int
 122 fuzzer_size_trigger(unsigned long *cur)
 123 {
 124     if (method != FLINEAR_SIZE)
 125         return 0;
 126     if (fnum == (*cur)++)
 127         return 1;
 128     return 0;
 129 }
 130
 131 static size_t
 132 fuzzer_length_len (size_t len)
 133 {
 134     if (fuzzer_size_trigger(&fsize)) {
 135         len = 0;
 136     } else if (fuzzer_size_trigger(&fsize)) {
 137         len = 129;
 138     } else if (fuzzer_size_trigger(&fsize)) {
 139         len = 0xffff;
 140     }
 141
 142     if (len < 128)
 143         return 1;
 144     else {
 145         int ret = 0;
 146         do {
 147             ++ret;
 148             len /= 256;
 149         } while (len);
 150         return ret + 1;
 151     }
 152 }
 153
 154 static int
 155 fuzzer_put_length (unsigned char *p, size_t len, size_t val, size_t *size)
 156 {
 157     if (len < 1)
 158         return ASN1_OVERFLOW;
 159
 160     if (fuzzer_size_trigger(&fcur)) {
 161         val = 0;
 162     } else if (fuzzer_size_trigger(&fcur)) {
 163         val = 129;
 164     } else if (fuzzer_size_trigger(&fcur)) {
 165         val = 0xffff;
 166     }
 167
 168     if (val < 128) {
 169         *p = val;
 170         *size = 1;
 171     } else {
 172         size_t l = 0;
 173
 174         while(val > 0) {
 175             if(len < 2)
 176                 return ASN1_OVERFLOW;
 177             *p-- = val % 256;
 178             val /= 256;
 179             len--;
 180             l++;
 181         }
 182         *p = 0x80 | l;
 183         if(size)
 184             *size = l + 1;
 185     }
 186     return 0;
 187 }
 188
 189 static int
 190 fuzzer_put_tag (unsigned char *p, size_t len, Der_class class, Der_type type,
 191                 unsigned int tag, size_t *size)
 192 {
 193     unsigned fcont = 0;
 194
 195     if (tag <= 30) {
 196         if (len < 1)
 197             return ASN1_OVERFLOW;
 198         if (fuzzer_trigger(100))
 199             *p = MAKE_TAG(class, type, 0x1f);
 200         else
 201             *p = MAKE_TAG(class, type, tag);
 202         *size = 1;
 203     } else {
 204         size_t ret = 0;
 205         unsigned int continuation = 0;
 206
 207         do {
 208             if (len < 1)
 209                 return ASN1_OVERFLOW;
 210             *p-- = tag % 128 | continuation;
 211             len--;
 212             ret++;
 213             tag /= 128;
 214             continuation = 0x80;
 215         } while(tag > 0);
 216         if (len < 1)
 217             return ASN1_OVERFLOW;
 218         if (fuzzer_trigger(100))
 219             *p-- = MAKE_TAG(class, type, 0);
 220         else
 221             *p-- = MAKE_TAG(class, type, 0x1f);
 222         ret++;
 223         *size = ret;
 224     }
 225     return 0;
 226 }
 227
 228 static int
 229 fuzzer_put_length_and_tag (unsigned char *p, size_t len, size_t len_val,
 230                            Der_class class, Der_type type,
 231                            unsigned int tag, size_t *size)
 232 {
 233     size_t ret = 0;
 234     size_t l;
 235     int e;
 236
 237     e = fuzzer_put_length (p, len, len_val, &l);
 238     if(e)
 239         return e;
 240     p -= l;
 241     len -= l;
 242     ret += l;
 243     e = fuzzer_put_tag (p, len, class, type, tag, &l);
 244     if(e)
 245         return e;
 246
 247     ret += l;
 248     *size = ret;
 249     return 0;
 250 }
 251
 252 static int
 253 fuzzer_put_general_string (unsigned char *p, size_t len,
 254                            const heim_general_string *str, size_t *size)
 255 {
 256     size_t slen = strlen(*str);
 257
 258     if (len < slen)
 259         return ASN1_OVERFLOW;
 260     p -= slen;
 261     if (slen >= 2 && fuzzer_trigger(100)) {
 262         memcpy(p+1, *str, slen);
 263         memcpy(p+1, "%s", 2);
 264     } else if (slen >= 2 && fuzzer_trigger(100)) {
 265         memcpy(p+1, *str, slen);
 266         memcpy(p+1, "%n", 2);
 267     } else if (slen >= 4 && fuzzer_trigger(100)) {
 268         memcpy(p+1, *str, slen);
 269         memcpy(p+1, "%10n", 4);
 270     } else if (slen >= 10 && fuzzer_trigger(100)) {
 271         memcpy(p+1, *str, slen);
 272         memcpy(p+1, "%n%n%n%n%n", 10);
 273     } else if (slen >= 10 && fuzzer_trigger(100)) {
 274         memcpy(p+1, *str, slen);
 275         memcpy(p+1, "%n%p%s%d%x", 10);
 276     } else if (slen >= 7 && fuzzer_trigger(100)) {
 277         memcpy(p+1, *str, slen);
 278         memcpy(p+1, "%.1024d", 7);
 279     } else if (slen >= 7 && fuzzer_trigger(100)) {
 280         memcpy(p+1, *str, slen);
 281         memcpy(p+1, "%.2049d", 7);
 282     } else if (fuzzer_trigger(100)) {
 283         memset(p+1, 0, slen);
 284     } else if (fuzzer_trigger(100)) {
 285         memset(p+1, 0xff, slen);
 286     } else if (fuzzer_trigger(100)) {
 287         memset(p+1, 'A', slen);
 288     } else {
 289         memcpy(p+1, *str, slen);
 290     }
 291     *size = slen;
 292     return 0;
 293 }
 294
 295
 296 struct asn1_type_func fuzzerprim[A1T_NUM_ENTRY] = {
 297 #define fuzel(name, type) {                             \
 298         (asn1_type_encode)fuzzer_put_##name,            \
 299         (asn1_type_decode)der_get_##name,               \
 300         (asn1_type_length)der_length_##name,            \
 301         (asn1_type_copy)der_copy_##name,                \
 302         (asn1_type_release)der_free_##name,             \
 303         sizeof(type)                                    \
 304     }
 305 #define el(name, type) {                                \
 306         (asn1_type_encode)der_put_##name,               \
 307         (asn1_type_decode)der_get_##name,               \
 308         (asn1_type_length)der_length_##name,            \
 309         (asn1_type_copy)der_copy_##name,                \
 310         (asn1_type_release)der_free_##name,             \
 311         sizeof(type)                                    \
 312     }
 313 #define elber(name, type) {                             \
 314         (asn1_type_encode)der_put_##name,               \
 315         (asn1_type_decode)der_get_##name##_ber,         \
 316         (asn1_type_length)der_length_##name,            \
 317         (asn1_type_copy)der_copy_##name,                \
 318         (asn1_type_release)der_free_##name,             \
 319         sizeof(type)                                    \
 320     }
 321     el(integer, int),
 322     el(integer64, int64_t),
 323     el(heim_integer, heim_integer),
 324     el(integer, int),
 325     el(unsigned, unsigned),
 326     el(uninteger64, uint64_t),
 327     fuzel(general_string, heim_general_string),
 328     el(octet_string, heim_octet_string),
 329     elber(octet_string, heim_octet_string),
 330     el(ia5_string, heim_ia5_string),
 331     el(bmp_string, heim_bmp_string),
 332     el(universal_string, heim_universal_string),
 333     el(printable_string, heim_printable_string),
 334     el(visible_string, heim_visible_string),
 335     el(utf8string, heim_utf8_string),
 336     el(generalized_time, time_t),
 337     el(utctime, time_t),
 338     el(bit_string, heim_bit_string),
 339     { (asn1_type_encode)der_put_boolean, (asn1_type_decode)der_get_boolean,
 340       (asn1_type_length)der_length_boolean, (asn1_type_copy)der_copy_integer,
 341       (asn1_type_release)der_free_integer, sizeof(int)
 342     },
 343     el(oid, heim_oid),
 344     el(general_string, heim_general_string),
 345 #undef fuzel
 346 #undef el
 347 #undef elber
 348 };
 349
 350
 351
 352 int
 353 _asn1_encode_fuzzer(const struct asn1_template *t,
 354                     unsigned char *p, size_t len,
 355                     const void *data, size_t *size)
 356 {
 357     size_t elements = A1_HEADER_LEN(t);
 358     int ret = 0;
 359     size_t oldlen = len;
 360
 361     t += A1_HEADER_LEN(t);
 362
 363     while (elements) {
 364         switch (t->tt & A1_OP_MASK) {
 365         case A1_OP_TYPE:
 366         case A1_OP_TYPE_EXTERN: {
 367             size_t newsize;
 368             const void *el = DPOC(data, t->offset);
 369
 370             if (t->tt & A1_FLAG_OPTIONAL) {
 371                 void **pel = (void **)el;
 372                 if (*pel == NULL)
 373                     break;
 374                 el = *pel;
 375             }
 376
 377             if ((t->tt & A1_OP_MASK) == A1_OP_TYPE) {
 378                 ret = _asn1_encode_fuzzer(t->ptr, p, len, el, &newsize);
 379             } else {
 380                 const struct asn1_type_func *f = t->ptr;
 381                 ret = (f->encode)(p, len, el, &newsize);
 382             }
 383
 384             if (ret)
 385                 return ret;
 386             p -= newsize; len -= newsize;
 387
 388             break;
 389         }
 390         case A1_OP_TAG: {
 391             const void *olddata = data;
 392             size_t l, datalen;
 393
 394             data = DPOC(data, t->offset);
 395
 396             if (t->tt & A1_FLAG_OPTIONAL) {
 397                 void **el = (void **)data;
 398                 if (*el == NULL) {
 399                     data = olddata;
 400                     break;
 401                 }
 402                 data = *el;
 403             }
 404
 405             ret = _asn1_encode_fuzzer(t->ptr, p, len, data, &datalen);
 406             if (ret)
 407                 return ret;
 408
 409             len -= datalen; p -= datalen;
 410
 411             ret = fuzzer_put_length_and_tag(p, len, datalen,
 412                                             A1_TAG_CLASS(t->tt),
 413                                             A1_TAG_TYPE(t->tt),
 414                                             A1_TAG_TAG(t->tt), &l);
 415             if (ret)
 416                 return ret;
 417
 418             p -= l; len -= l;
 419
 420             data = olddata;
 421
 422             break;
 423         }
 424         case A1_OP_PARSE: {
 425             unsigned int type = A1_PARSE_TYPE(t->tt);
 426             size_t newsize;
 427             const void *el = DPOC(data, t->offset);
 428
 429             if (type > sizeof(fuzzerprim)/sizeof(fuzzerprim[0])) {
 430                 ABORT_ON_ERROR();
 431                 return ASN1_PARSE_ERROR;
 432             }
 433
 434             ret = (fuzzerprim[type].encode)(p, len, el, &newsize);
 435             if (ret)
 436                 return ret;
 437             p -= newsize; len -= newsize;
 438
 439             break;
 440         }
 441         case A1_OP_SETOF: {
 442             const struct template_of *el = DPOC(data, t->offset);
 443             size_t ellen = _asn1_sizeofType(t->ptr);
 444             heim_octet_string *val;
 445             unsigned char *elptr = el->val;
 446             size_t i, totallen;
 447
 448             if (el->len == 0)
 449                 break;
 450
 451             if (el->len > UINT_MAX/sizeof(val[0]))
 452                 return ERANGE;
 453
 454             val = malloc(sizeof(val[0]) * el->len);
 455             if (val == NULL)
 456                 return ENOMEM;
 457
 458             for(totallen = 0, i = 0; i < el->len; i++) {
 459                 unsigned char *next;
 460                 size_t l;
 461
 462                 val[i].length = _asn1_length(t->ptr, elptr);
 463                 val[i].data = malloc(val[i].length);
 464
 465                 ret = _asn1_encode_fuzzer(t->ptr, DPO(val[i].data, val[i].length - 1),
 466                                           val[i].length, elptr, &l);
 467                 if (ret)
 468                     break;
 469
 470                 next = elptr + ellen;
 471                 if (next < elptr) {
 472                     ret = ASN1_OVERFLOW;
 473                     break;
 474                 }
 475                 elptr = next;
 476                 totallen += val[i].length;
 477             }
 478             if (ret == 0 && totallen > len)
 479                 ret = ASN1_OVERFLOW;
 480             if (ret) {
 481                 do {
 482                     free(val[i].data);
 483                 } while(i-- > 0);
 484                 free(val);
 485                 return ret;
 486             }
 487
 488             len -= totallen;
 489
 490             qsort(val, el->len, sizeof(val[0]), _heim_der_set_sort);
 491
 492             i = el->len - 1;
 493             do {
 494                 p -= val[i].length;
 495                 memcpy(p + 1, val[i].data, val[i].length);
 496                 free(val[i].data);
 497             } while(i-- > 0);
 498             free(val);
 499
 500             break;
 501
 502         }
 503         case A1_OP_SEQOF: {
 504             struct template_of *el = DPO(data, t->offset);
 505             size_t ellen = _asn1_sizeofType(t->ptr);
 506             size_t newsize;
 507             unsigned int i;
 508             unsigned char *elptr = el->val;
 509
 510             if (el->len == 0)
 511                 break;
 512
 513             elptr += ellen * (el->len - 1);
 514
 515             for (i = 0; i < el->len; i++) {
 516                 ret = _asn1_encode_fuzzer(t->ptr, p, len,
 517                                    elptr,
 518                                    &newsize);
 519                 if (ret)
 520                     return ret;
 521                 p -= newsize; len -= newsize;
 522                 elptr -= ellen;
 523             }
 524
 525             break;
 526         }
 527         case A1_OP_BMEMBER: {
 528             const struct asn1_template *bmember = t->ptr;
 529             size_t size = bmember->offset;
 530             size_t elements = A1_HEADER_LEN(bmember);
 531             size_t pos;
 532             unsigned char c = 0;
 533             unsigned int bitset = 0;
 534             int rfc1510 = (bmember->tt & A1_HBF_RFC1510);
 535
 536             bmember += elements;
 537
 538             if (rfc1510)
 539                 pos = 31;
 540             else
 541                 pos = bmember->offset;
 542
 543             while (elements && len) {
 544                 while (bmember->offset / 8 < pos / 8) {
 545                     if (rfc1510 || bitset || c) {
 546                         if (len < 1)
 547                             return ASN1_OVERFLOW;
 548                         *p-- = c; len--;
 549                     }
 550                     c = 0;
 551                     pos -= 8;
 552                 }
 553                 _asn1_bmember_put_bit(&c, data, bmember->offset, size, &bitset);
 554                 elements--; bmember--;
 555             }
 556             if (rfc1510 || bitset) {
 557                 if (len < 1)
 558                     return ASN1_OVERFLOW;
 559                 *p-- = c; len--;
 560             }
 561
 562             if (len < 1)
 563                 return ASN1_OVERFLOW;
 564             if (rfc1510 || bitset == 0)
 565                 *p-- = 0;
 566             else
 567                 *p-- = bitset - 1;
 568
 569             len--;
 570
 571             break;
 572         }
 573         case A1_OP_CHOICE: {
 574             const struct asn1_template *choice = t->ptr;
 575             const unsigned int *element = DPOC(data, choice->offset);
 576             size_t datalen;
 577             const void *el;
 578
 579             if (*element > A1_HEADER_LEN(choice)) {
 580                 printf("element: %d\n", *element);
 581                 return ASN1_PARSE_ERROR;
 582             }
 583
 584             if (*element == 0) {
 585                 ret += der_put_octet_string(p, len,
 586                                             DPOC(data, choice->tt), &datalen);
 587             } else {
 588                 choice += *element;
 589                 el = DPOC(data, choice->offset);
 590                 ret = _asn1_encode_fuzzer(choice->ptr, p, len, el, &datalen);
 591                 if (ret)
 592                     return ret;
 593             }
 594             len -= datalen; p -= datalen;
 595
 596             break;
 597         }
 598         default:
 599             ABORT_ON_ERROR();
 600         }
 601         t--;
 602         elements--;
 603     }
 604
 605     if (fuzzer_trigger(1000)) {
 606         memset(p + 1, 0, oldlen - len);
 607     } else if (fuzzer_trigger(1000)) {
 608         memset(p + 1, 0x41, oldlen - len);
 609     } else if (fuzzer_trigger(1000)) {
 610         memset(p + 1, 0xff, oldlen - len);
 611     }
 612
 613     if (size)
 614         *size = oldlen - len;
 615
 616     return 0;
 617 }
 618
 619 size_t
 620 _asn1_length_fuzzer(const struct asn1_template *t, const void *data)
 621 {
 622     size_t elements = A1_HEADER_LEN(t);
 623     size_t ret = 0;
 624
 625     t += A1_HEADER_LEN(t);
 626
 627     while (elements) {
 628         switch (t->tt & A1_OP_MASK) {
 629         case A1_OP_TYPE:
 630         case A1_OP_TYPE_EXTERN: {
 631             const void *el = DPOC(data, t->offset);
 632
 633             if (t->tt & A1_FLAG_OPTIONAL) {
 634                 void **pel = (void **)el;
 635                 if (*pel == NULL)
 636                     break;
 637                 el = *pel;
 638             }
 639
 640             if ((t->tt & A1_OP_MASK) == A1_OP_TYPE) {
 641                 ret += _asn1_length(t->ptr, el);
 642             } else {
 643                 const struct asn1_type_func *f = t->ptr;
 644                 ret += (f->length)(el);
 645             }
 646             break;
 647         }
 648         case A1_OP_TAG: {
 649             size_t datalen;
 650             const void *olddata = data;
 651
 652             data = DPO(data, t->offset);
 653
 654             if (t->tt & A1_FLAG_OPTIONAL) {
 655                 void **el = (void **)data;
 656                 if (*el == NULL) {
 657                     data = olddata;
 658                     break;
 659                 }
 660                 data = *el;
 661             }
 662             datalen = _asn1_length(t->ptr, data);
 663             ret += der_length_tag(A1_TAG_TAG(t->tt)) + fuzzer_length_len(datalen);
 664             ret += datalen;
 665             data = olddata;
 666             break;
 667         }
 668         case A1_OP_PARSE: {
 669             unsigned int type = A1_PARSE_TYPE(t->tt);
 670             const void *el = DPOC(data, t->offset);
 671
 672             if (type > sizeof(asn1_template_prim)/sizeof(asn1_template_prim[0])) {
 673                 ABORT_ON_ERROR();
 674                 break;
 675             }
 676             ret += (asn1_template_prim[type].length)(el);
 677             break;
 678         }
 679         case A1_OP_SETOF:
 680         case A1_OP_SEQOF: {
 681             const struct template_of *el = DPOC(data, t->offset);
 682             size_t ellen = _asn1_sizeofType(t->ptr);
 683             const unsigned char *element = el->val;
 684             unsigned int i;
 685
 686             for (i = 0; i < el->len; i++) {
 687                 ret += _asn1_length(t->ptr, element);
 688                 element += ellen;
 689             }
 690
 691             break;
 692         }
 693         case A1_OP_BMEMBER: {
 694             const struct asn1_template *bmember = t->ptr;
 695             size_t size = bmember->offset;
 696             size_t elements = A1_HEADER_LEN(bmember);
 697             int rfc1510 = (bmember->tt & A1_HBF_RFC1510);
 698
 699             if (rfc1510) {
 700                 ret += 5;
 701             } else {
 702
 703                 ret += 1;
 704
 705                 bmember += elements;
 706
 707                 while (elements) {
 708                     if (_asn1_bmember_isset_bit(data, bmember->offset, size)) {
 709                         ret += (bmember->offset / 8) + 1;
 710                         break;
 711                     }
 712                     elements--; bmember--;
 713                 }
 714             }
 715             break;
 716         }
 717         case A1_OP_CHOICE: {
 718             const struct asn1_template *choice = t->ptr;
 719             const unsigned int *element = DPOC(data, choice->offset);
 720
 721             if (*element > A1_HEADER_LEN(choice))
 722                 break;
 723
 724             if (*element == 0) {
 725                 ret += der_length_octet_string(DPOC(data, choice->tt));
 726             } else {
 727                 choice += *element;
 728                 ret += _asn1_length(choice->ptr, DPOC(data, choice->offset));
 729             }
 730             break;
 731         }
 732         default:
 733             ABORT_ON_ERROR();
 734             break;
 735         }
 736         elements--;
 737         t--;
 738     }
 739     return ret;
 740 }
 741
 742 #endif /* ASN1_FUZZER */