ctx->cq_extra should be protected by completion lock so that the
req_need_defer() does the right check.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Hao Xu <haoxu@xxxxxxxxxxxxxxxxx>
---
fs/io_uring.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index f666a0e7f5e8..ae9534382b26 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -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) {
--
2.24.4
