netdev - [PATCH io_uring for-6.18 07/20] io_uring/zcrx: check all niovs filled with dma addresses

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Message-ID: <e15dea1bae569f620c28edc887596470f3f37322.1758030357.git.asml.silence@gmail.com>
Date: Tue, 16 Sep 2025 15:27:50 +0100
From: Pavel Begunkov <asml.silence@...il.com>
To: io-uring@...r.kernel.org
Cc: asml.silence@...il.com,
	axboe@...nel.dk,
	netdev@...r.kernel.org
Subject: [PATCH io_uring for-6.18 07/20] 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@...il.com>
---
 io_uring/zcrx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
index ef8d60b92646..0f15e0fa5467 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;
 }
 
-- 
2.49.0