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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2015-09-26 19:09:21 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-09-29 19:32:46 +0200 |
| commit | a723bab3d7529133f71fc8a5e96f86e3639a0d13 (patch) | |
| tree | 658d5b5c71b7851f34ed07ce8c0022915acd33e4 /block/t10-pi.c | |
| parent | blk-mq: fix sysfs registration/unregistration race (diff) | |
| download | linux-a723bab3d7529133f71fc8a5e96f86e3639a0d13.tar.xz linux-a723bab3d7529133f71fc8a5e96f86e3639a0d13.zip | |
blk-mq: Fix use after of free q->mq_map
CPU hotplug handling for blk-mq (blk_mq_queue_reinit) updates
q->mq_map by blk_mq_update_queue_map() for all request queues in
all_q_list. On the other hand, q->mq_map is released before deleting
the queue from all_q_list.
So if CPU hotplug event occurs in the window, invalid memory access
can happen. Fix it by releasing q->mq_map in blk_mq_release() to make
it happen latter than removal from all_q_list.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Suggested-by: Ming Lei <tom.leiming@gmail.com>
Reviewed-by: Ming Lei <tom.leiming@gmail.com>
Cc: Ming Lei <tom.leiming@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/t10-pi.c')
0 files changed, 0 insertions, 0 deletions