[PATCH for-next 1/4] io_uring: protect cq_timeouts with timeout_lock

[Pavel Begunkov <asml.silence@gmail.com>]

Read cq_timeouts in io_flush_timeouts() only after taking the
timeout_lock, as it's protected by it. There are many places where we
also grab ->completion_lock, but for instance io_timeout_fn() doesn't
and still modifies cq_timeouts.

Cc: stable@vger.kernel.org
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/timeout.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/io_uring/timeout.c b/io_uring/timeout.c
index 5b4bc93fd6e0..4c6a5666541c 100644
--- a/io_uring/timeout.c
+++ b/io_uring/timeout.c
@@ -72,10 +72,12 @@ static bool io_kill_timeout(struct io_kiocb *req, int status)
 __cold void io_flush_timeouts(struct io_ring_ctx *ctx)
 	__must_hold(&ctx->completion_lock)
 {
-	u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts);
+	u32 seq;
 	struct io_timeout *timeout, *tmp;
 
 	spin_lock_irq(&ctx->timeout_lock);
+	seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts);
+
 	list_for_each_entry_safe(timeout, tmp, &ctx->timeout_list, list) {
 		struct io_kiocb *req = cmd_to_io_kiocb(timeout);
 		u32 events_needed, events_got;
-- 
2.38.1