net: ethernet: mtk_eth_soc: fix potential memory leak in mtk_rx_alloc()

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When fail to dma_map_single() in mtk_rx_alloc(), it returns directly.
But the memory allocated for local variable data is not freed, and
local variabel data has not been attached to ring->data[i] yet, so the
memory allocated for local variable data will not be freed outside
mtk_rx_alloc() too. Thus memory leak would occur in this scenario.

Add skb_free_frag(data) when dma_map_single() failed.

Fixes: 23233e577e ("net: ethernet: mtk_eth_soc: rely on page_pool for single page buffers")
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Acked-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Link: https://lore.kernel.org/r/20221120035405.1464341-1-william.xuanziyang@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Ziyang Xuan 2022-11-20 11:54:05 +08:00 • committed by Jakub Kicinski

parent 0972457f58

commit 3213f808ae

1 changed files with 3 additions and 1 deletions

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drivers/net/ethernet/mediatek/mtk_eth_soc.c

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