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io_uring: fix no lock protection for ctx->cq_extra

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ctx->cq_extra should be protected by completion lock so that the
req_need_defer() does the right check.

Cc: stable@vger.kernel.org
Signed-off-by: Hao Xu <haoxu@linux.alibaba.com>
Link: https://lore.kernel.org/r/20211125092103.224502-2-haoxu@linux.alibaba.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Hao Xu 2021-11-25 17:21:02 +08:00 committed by Jens Axboe
parent 5562a8d71a
commit e302f1046f
1 changed files with 3 additions and 0 deletions
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3
fs/io_uring.c
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@ -6537,12 +6537,15 @@ static __cold void io_drain_req(struct io_kiocb *req)
u32 seq = io_get_sequence(req);
/* Still need defer if there is pending req in defer list. */
spin_lock(&ctx->completion_lock);
if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list)) {
spin_unlock(&ctx->completion_lock);
queue:
ctx->drain_active = false;
io_req_task_queue(req);
return;
}
spin_unlock(&ctx->completion_lock);
ret = io_req_prep_async(req);
if (ret) {