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| author | Carsten Emde <Carsten.Emde@osadl.org> | 2009-09-12 02:05:37 +0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2009-09-13 05:31:19 +0400 |
| commit | fe63b94a430c0c8058de317f0a8ce921c69dbee4 (patch) | |
| tree | 113a32a157b4629e7ca37debdc0cdc59a4c11e52 /include/trace/syscall.h | |
| parent | 689fd8b65d669b96d612ccc37d6fb87bf7ed6907 (diff) | |
| download | linux-fe63b94a430c0c8058de317f0a8ce921c69dbee4.tar.xz | |
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>
Diffstat (limited to 'include/trace/syscall.h')
0 files changed, 0 insertions, 0 deletions