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(parent: 9637d51) | patch
io_uring: fix the sequence comparison in io_sequence_defer
authorZhengyuan Liu <liuzhengyuan@kylinos.cn>
Sat, 13 Jul 2019 03:58:26 +0000 (11:58 +0800)
committerJens Axboe <axboe@kernel.dk>
Tue, 16 Jul 2019 14:27:09 +0000 (08:27 -0600)
commitdbd0f6d6c2a11eb9c31ca9cd454f95bb5713e92e
treebf49250d4c59d6b4ed45b9075cf9c3d793872064tree | snapshot
parent9637d517347e80ee2fe1c5d8ce45ba1b88d8b5cdcommit | diff
io_uring: fix the sequence comparison in io_sequence_defer

sq->cached_sq_head and cq->cached_cq_tail are both unsigned int. If
cached_sq_head overflows before cached_cq_tail, then we may miss a
barrier req. As cached_cq_tail always follows cached_sq_head, the NQ
should be enough.

Cc: stable@vger.kernel.org
Fixes: de0617e46717 ("io_uring: add support for marking commands as draining")
Signed-off-by: Zhengyuan Liu <liuzhengyuan@kylinos.cn>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
fs/io_uring.c diff | blob | history
Domain: System / Kernel;