From b9e31f59478eeae3e4230308f6fc06713c6fc547 Mon Sep 17 00:00:00 2001 From: Johannes Sixt Date: Thu, 4 Apr 2013 20:41:43 +0200 Subject: [PATCH] rerere forget: do not segfault if not all stages are present The loop that fills in the buffers that are later passed to the merge driver exits early when not all stages of a path are present in the index. But since the buffer pointers are not initialized in advance, the subsequent accesses are undefined. Initialize buffer pointers in advance to avoid undefined behavior later. That is not sufficient, though, to get correct operation of handle_cache(). The function replays a conflicted merge to extract the part inside the conflict markers. As written, the loop exits early when a stage is missing. Consequently, the buffers for later stages that would be present in the index are not filled in and the merge is replayed with incomplete data. Fix it by investigating all stages of the given path. Signed-off-by: Johannes Sixt Signed-off-by: Junio C Hamano --- rerere.c | 15 +++++++-------- t/t2030-unresolve-info.sh | 13 +++++++++++++ 2 files changed, 20 insertions(+), 8 deletions(-) diff --git a/rerere.c b/rerere.c index 4d940cd375..98e3e294d0 100644 --- a/rerere.c +++ b/rerere.c @@ -297,7 +297,7 @@ static int rerere_mem_getline(struct strbuf *sb, struct rerere_io *io_) static int handle_cache(const char *path, unsigned char *sha1, const char *output) { - mmfile_t mmfile[3]; + mmfile_t mmfile[3] = {{NULL}}; mmbuffer_t result = {NULL, 0}; struct cache_entry *ce; int pos, len, i, hunk_no; @@ -316,17 +316,16 @@ static int handle_cache(const char *path, unsigned char *sha1, const char *outpu for (i = 0; i < 3; i++) { enum object_type type; unsigned long size; + int j; - mmfile[i].size = 0; - mmfile[i].ptr = NULL; if (active_nr <= pos) break; ce = active_cache[pos++]; - if (ce_namelen(ce) != len || memcmp(ce->name, path, len) - || ce_stage(ce) != i + 1) - break; - mmfile[i].ptr = read_sha1_file(ce->sha1, &type, &size); - mmfile[i].size = size; + if (ce_namelen(ce) != len || memcmp(ce->name, path, len)) + continue; + j = ce_stage(ce) - 1; + mmfile[j].ptr = read_sha1_file(ce->sha1, &type, &size); + mmfile[j].size = size; } for (i = 0; i < 3; i++) { if (!mmfile[i].ptr && !mmfile[i].size) diff --git a/t/t2030-unresolve-info.sh b/t/t2030-unresolve-info.sh index 0b699f50dd..309199bca2 100755 --- a/t/t2030-unresolve-info.sh +++ b/t/t2030-unresolve-info.sh @@ -54,8 +54,11 @@ test_expect_success setup ' test_commit second fi/le second && git checkout side && test_commit third fi/le third && + git branch add-add && git checkout another && test_commit fourth fi/le fourth && + git checkout add-add && + test_commit fifth add-differently && git checkout master ' @@ -179,4 +182,14 @@ test_expect_success 'rerere forget (binary)' ' git rerere forget binary ' +test_expect_success 'rerere forget (add-add conflict)' ' + git checkout -f master && + echo master >add-differently && + git add add-differently && + git commit -m "add differently" && + test_must_fail git merge fifth && + git rerere forget add-differently 2>actual && + test_i18ngrep "no remembered" actual +' + test_done -- 2.11.4.GIT