From: Daniel Golle <daniel@makrotopia.org>
To: netdev@vger.kernel.org, linux-mediatek@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Felix Fietkau <nbd@nbd.name>,
John Crispin <john@phrozen.org>,
Sean Wang <sean.wang@mediatek.com>,
Mark Lee <Mark-MC.Lee@mediatek.com>,
Lorenzo Bianconi <lorenzo@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>
Subject: [PATCH net] net: ethernet: mtk_eth_soc: fix NULL pointer dereference
Date: Tue, 9 May 2023 03:20:06 +0200 [thread overview]
Message-ID: <ZFmfxpsd8Fiqc7K_@pidgin.makrotopia.org> (raw)
Check for NULL pointer to avoid kernel crashing in case of missing WO
firmware in case only a single WEDv2 device has been initialized, e.g. on
MT7981 which can connect just one wireless frontend.
Fixes: 86ce0d09e424 ("net: ethernet: mtk_eth_soc: use WO firmware for MT7981")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
drivers/net/ethernet/mediatek/mtk_wed.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet/mediatek/mtk_wed.c
index 4c205afbd230..985cff910f30 100644
--- a/drivers/net/ethernet/mediatek/mtk_wed.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed.c
@@ -654,7 +654,7 @@ __mtk_wed_detach(struct mtk_wed_device *dev)
BIT(hw->index), BIT(hw->index));
}
- if (!hw_list[!hw->index]->wed_dev &&
+ if ((!hw_list[!hw->index] || !hw_list[!hw->index]->wed_dev) &&
hw->eth->dma_dev != hw->eth->dev)
mtk_eth_set_dma_device(hw->eth, hw->eth->dev);
--
2.40.0
next reply other threads:[~2023-05-09 1:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-09 1:20 Daniel Golle [this message]
2023-05-09 8:14 ` [PATCH net] net: ethernet: mtk_eth_soc: fix NULL pointer dereference Simon Horman
2023-05-10 8:30 ` patchwork-bot+netdevbpf
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