From: Pavel Begunkov <asml.silence@gmail.com>
Date: Wed, 2 Jul 2025 14:29:08 +0000 (+0100)
Subject: io_uring/zcrx: assert area type in io_zcrx_iov_page
X-Git-Tag: for-6.17/io_uring-20250728~17
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=1b4dc1ff0a8887c2fbb83a48e87284375ab4b02a;p=linux-block.git

io_uring/zcrx: assert area type in io_zcrx_iov_page

Add a simple debug assertion to io_zcrx_iov_page() making it's not
trying to return pages for a dmabuf area.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c3c30a926a18436a399a1768f3cc86c76cd17fa7.1751466461.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 3f3c8cbde61e..208d1943a9fd 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c
@@ -44,6 +44,8 @@ static inline struct page *io_zcrx_iov_page(const struct net_iov *niov)
 {
 	struct io_zcrx_area *area = io_zcrx_iov_to_area(niov);
 
+	lockdep_assert(!area->mem.is_dmabuf);
+
 	return area->mem.pages[net_iov_idx(niov)];
 }