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authorCarsten Emde <Carsten.Emde@osadl.org>2009-09-12 00:05:37 +0200
committerSteven Rostedt <rostedt@goodmis.org>2009-09-12 21:31:19 -0400
commitfe63b94a430c0c8058de317f0a8ce921c69dbee4 (patch)
tree113a32a157b4629e7ca37debdc0cdc59a4c11e52 /init
parent689fd8b65d669b96d612ccc37d6fb87bf7ed6907 (diff)
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 'init')
0 files changed, 0 insertions, 0 deletions