[PATCH 3/4] io_uring: use mem_is_zero to check ring params

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

mem_is_zero() does the job without hand rolled loops, use that to verify
reserved fields of ring params.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 io_uring/io_uring.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 023b0e3a829c..af7b4cbe9850 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -3684,14 +3684,12 @@ static __cold int io_uring_create(struct io_uring_params *p,
 static long io_uring_setup(u32 entries, struct io_uring_params __user *params)
 {
 	struct io_uring_params p;
-	int i;
 
 	if (copy_from_user(&p, params, sizeof(p)))
 		return -EFAULT;
-	for (i = 0; i < ARRAY_SIZE(p.resv); i++) {
-		if (p.resv[i])
-			return -EINVAL;
-	}
+
+	if (!mem_is_zero(&p.resv, sizeof(p.resv)))
+		return -EINVAL;
 
 	if (p.flags & ~IORING_SETUP_FLAGS)
 		return -EINVAL;
-- 
2.49.0