| commit | fe63b94a430c0c8058de317f0a8ce921c69dbee4 | |
| author | Carsten Emde <Carsten.Emde@osadl.org> | |
| Fri, 11 Sep 2009 22:05:37 +0000 (12 00:05 +0200) | ||
| committer | Steven Rostedt <rostedt@goodmis.org> | |
| Sun, 13 Sep 2009 01:31:19 +0000 (12 21:31 -0400) | ||
| tree | 113a32a157b4629e7ca37debdc0cdc59a4c11e52 | treesnapshot (tar.gz zip) |
| parent | 689fd8b65d669b96d612ccc37d6fb87bf7ed6907 | commitdiff |
tracing: prevent NULL pointer dereference in ftrace_raw_event_block_bio_bounce
Booting 2.6.31 and executing
echo 1 >/sys/kernel/debug/tracing/events/enable
leads to
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<c032a583>] ftrace_raw_event_block_bio_bounce+0x4b/0xb9
Apparently,
bio = bio_map_user(q, NULL, uaddr, len, reading, gfp_mask);
is called in block/blk-map.c:58 where bio->bi_bdev in set to NULL and
still is NULL when an attempt is made to evaluate bio->bi_bdev->bd_dev
in include/trace/events/block.h:189.
The tracepoint should ensure bio->bi_bdev is not dereferenced, if NULL.
Signed-off-by: Carsten Emde <C.Emde@osadl.org>
LKML-Reference: <4AAAC9B1.9060505@osadl.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Booting 2.6.31 and executing
echo 1 >/sys/kernel/debug/tracing/events/enable
leads to
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<c032a583>] ftrace_raw_event_block_bio_bounce+0x4b/0xb9
Apparently,
bio = bio_map_user(q, NULL, uaddr, len, reading, gfp_mask);
is called in block/blk-map.c:58 where bio->bi_bdev in set to NULL and
still is NULL when an attempt is made to evaluate bio->bi_bdev->bd_dev
in include/trace/events/block.h:189.
The tracepoint should ensure bio->bi_bdev is not dereferenced, if NULL.
Signed-off-by: Carsten Emde <C.Emde@osadl.org>
LKML-Reference: <4AAAC9B1.9060505@osadl.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| include/trace/events/block.h | diffblobblamehistory |