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net: ethernet: mtk_eth_soc: fix NULL pointer dereference

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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: 86ce0d09e4 ("net: ethernet: mtk_eth_soc: use WO firmware for MT7981")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Golle 2023-05-09 03:20:06 +02:00 • committed by David S. Miller
parent 582dbb2cc1
commit 7c83e28f10
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/mediatek/mtk_wed.c
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@ -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);