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| author | Wu Fengguang <fengguang.wu@intel.com> | 2012-02-04 20:54:03 -0600 |
|---|---|---|
| committer | Wu Fengguang <fengguang.wu@intel.com> | 2012-02-06 11:17:25 +0800 |
| commit | 977b7e3a52a7421ad33a393a38ece59f3d41c2fa (patch) | |
| tree | 8ad7bb97c2385c3407c4fb647cc932978057559d /mm | |
| parent | 3310225dfc71a35a2cc9340c15c0e08b14b3c754 (diff) | |
| download | op-kernel-dev-977b7e3a52a7421ad33a393a38ece59f3d41c2fa.zip op-kernel-dev-977b7e3a52a7421ad33a393a38ece59f3d41c2fa.tar.gz | |
writeback: fix dereferencing NULL bdi->dev on trace_writeback_queue
When a SD card is hot removed without umount, del_gendisk() will call
bdi_unregister() without destroying/freeing it. This leaves the bdi in
the bdi->dev = NULL, bdi->wb.task = NULL, bdi->bdi_list removed state.
When sync(2) gets the bdi before bdi_unregister() and calls
bdi_queue_work() after the unregister, trace_writeback_queue will be
dereferencing the NULL bdi->dev. Fix it with a simple test for NULL.
LKML-reference: http://lkml.org/lkml/2012/1/18/346
Cc: stable@kernel.org
Reported-by: Rabin Vincent <rabin@rab.in>
Tested-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions
