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authorJens Axboe <axboe@fb.com>2017-02-24 21:19:32 +0100
committerJens Axboe <axboe@fb.com>2017-02-24 21:19:32 +0100
commit61febef40bfe8ab68259d8545257686e8a0d91d1 (patch)
tree94d52c7e6d62b1f7381fc615c8964e0751e7ca08 /lib/radix-tree.c
parentblk-mq-sched: separate mark hctx and queue restart operations (diff)
downloadlinux-61febef40bfe8ab68259d8545257686e8a0d91d1.tar.xz
linux-61febef40bfe8ab68259d8545257686e8a0d91d1.zip
dm-rq: don't dereference request payload after ending request
Bart reported a case where dm would crash with use-after-free poison. This is due to dm_softirq_done() accessing memory associated with a request after calling end_request on it. This is most visible on !blk-mq, since we free the memory immediately for that case. Reported-by: Bart Van Assche <bart.vanassche@sandisk.com> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Fixes: eb8db831be80 ("dm: always defer request allocation to the owner of the request_queue") Signed-off-by: Jens Axboe <axboe@fb.com>
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