From: Pavel Begunkov <asml.silence@gmail.com>
Date: Mon, 23 Mar 2026 12:44:02 +0000 (+0000)
Subject: io_uring/zcrx: warn on a repeated area append
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f0b92207a00c731cfbfdefdcf9f9350a11e30ab3;p=thirdparty%2Fkernel%2Flinux.git

io_uring/zcrx: warn on a repeated area append

We only support a single area, no path should be able to call
io_zcrx_append_area() twice. Warn if that happens instead of just
returning an error.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://patch.msgid.link/28eb67fb8c48445584d7c247a36e1ad8800f0c8b.1774261953.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
index 77be6fb32df6e..e637052b645a3 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c
@@ -423,7 +423,7 @@ static void io_zcrx_free_area(struct io_zcrx_ifq *ifq,
 static int io_zcrx_append_area(struct io_zcrx_ifq *ifq,
 				struct io_zcrx_area *area)
 {
-	if (ifq->area)
+	if (WARN_ON_ONCE(ifq->area))
 		return -EINVAL;
 	ifq->area = area;
 	return 0;