From: Pavel Begunkov <asml.silence@gmail.com>
Date: Tue, 16 Sep 2025 14:27:50 +0000 (+0100)
Subject: io_uring/zcrx: check all niovs filled with dma addresses
X-Git-Tag: v6.18-rc1~137^2~17
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d7ae46b454eb05e3df0d46c2ac9c61416a4d9057;p=thirdparty%2Fkernel%2Flinux.git

io_uring/zcrx: check all niovs filled with dma addresses

Add a warning if io_populate_area_dma() can't fill in all net_iovs, it
should never happen.

Signed-off-by: Pavel Begunkov <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 ef8d60b926465..0f15e0fa5467e 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c
@@ -77,6 +77,9 @@ static int io_populate_area_dma(struct io_zcrx_ifq *ifq,
 			niov_idx++;
 		}
 	}
+
+	if (WARN_ON_ONCE(niov_idx != area->nia.num_niovs))
+		return -EFAULT;
 	return 0;
 }