From: Zhi-Jun You <hujy652@gmail.com>
To: Felix Fietkau <nbd@nbd.name>,
Lorenzo Bianconi <lorenzo@kernel.org>,
Andrew Lunn <andrew+netdev@lunn.ch>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@kernel.org>,
Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
Sujuan Chen <sujuan.chen@mediatek.com>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org,
Sashiko <sashiko-bot@kernel.org>,
stable@vger.kernel.org, Zhi-Jun You <hujy652@gmail.com>
Subject: [PATCH] net: ethernet: mtk_wed: fix double free in mtk_wed_rx_reset
Date: Wed, 04 Nov 2026 22:36:11 +0800 [thread overview]
Message-ID: <20261104-double-free-v1-1-efa52326702f@gmail.com> (raw)
mtk_wed_free_rx_buffer already calls mtk_wed_hwrro_free_buffer but
mtk_wed_rx_reset calls both subsequently. This would cause double free
because dma_free_coherent doesn't set freed desc to NULL.
Fix this by removing the mtk_wed_hwrro_free_buffer in mtk_wed_rx_reset.
Compile tested only because I don't own v3 hardware.
Fixes: 1543b8ff02f0 ("net: ethernet: mtk_wed: add wed 3.0 reset support")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Link: https://sashiko.dev/#/map/216156
Cc: stable@vger.kernel.org
Signed-off-by: Zhi-Jun You <hujy652@gmail.com>
---
drivers/net/ethernet/mediatek/mtk_wed.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet/mediatek/mtk_wed.c
index f40ac5794341..5e9674c9e63a 100644
--- a/drivers/net/ethernet/mediatek/mtk_wed.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed.c
@@ -1723,7 +1723,6 @@ mtk_wed_rx_reset(struct mtk_wed_device *dev)
false);
}
mtk_wed_free_rx_buffer(dev);
- mtk_wed_hwrro_free_buffer(dev);
return 0;
}
---
base-commit: 11140c51df12e594d6bf2c8d2af5dec63b0219ac
change-id: 20261104-double-free-b6b95c2539c6
Best regards,
--
Zhi-Jun You <hujy652@gmail.com>
reply other threads:[~2026-11-04 14:36 UTC|newest]
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