[PATCH][next] io_uring: ensure variable ret is initialized to zero

[Colin King <colin.king@xxxxxxxxxxxxx>]

From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

In the case where sig is NULL the error variable ret is not initialized
and may contain a garbage value on the final checks to see if ret is
-ERESTARTSYS.  Best to initialize ret to zero before the do loop to
ensure the ret does not accidentially contain -ERESTARTSYS before the
loop.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: dd671c79e40b ("io_uring: make CQ ring wakeups be more efficient")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
---
 fs/io_uring.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 7b5710e3a18c..aa8ac557493c 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2835,6 +2835,7 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
 			return ret;
 	}
 
+	ret = 0;
 	iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts);
 	do {
 		prepare_to_wait_exclusive(&ctx->wait, &iowq.wq,
-- 
2.20.1