| Message ID | 20221120035405.1464341-1-william.xuanziyang@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [net] net: ethernet: mtk_eth_soc: fix potential memory leak in mtk_rx_alloc() | expand |
> 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: 23233e577ef9 ("net: ethernet: mtk_eth_soc: rely on page_pool for single page buffers") > Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com> > --- > drivers/net/ethernet/mediatek/mtk_eth_soc.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) Acked-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com> > > diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c > index 7cd381530aa4..bc47ef1e4dd5 100644 > --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c > +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c > @@ -2378,8 +2378,10 @@ static int mtk_rx_alloc(struct mtk_eth *eth, int ring_no, int rx_flag) > data + NET_SKB_PAD + eth->ip_align, > ring->buf_size, DMA_FROM_DEVICE); > if (unlikely(dma_mapping_error(eth->dma_dev, > - dma_addr))) > + dma_addr))) { > + skb_free_frag(data); > return -ENOMEM; > + } > } > rxd->rxd1 = (unsigned int)dma_addr; > ring->data[i] = data; > -- > 2.25.1 >
Hello: This patch was applied to netdev/net.git (master) by Jakub Kicinski <kuba@kernel.org>: On Sun, 20 Nov 2022 11:54:05 +0800 you wrote: > 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. > > [...] Here is the summary with links: - [net] net: ethernet: mtk_eth_soc: fix potential memory leak in mtk_rx_alloc() https://git.kernel.org/netdev/net/c/3213f808ae21 You are awesome, thank you!
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index 7cd381530aa4..bc47ef1e4dd5 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -2378,8 +2378,10 @@ static int mtk_rx_alloc(struct mtk_eth *eth, int ring_no, int rx_flag) data + NET_SKB_PAD + eth->ip_align, ring->buf_size, DMA_FROM_DEVICE); if (unlikely(dma_mapping_error(eth->dma_dev, - dma_addr))) + dma_addr))) { + skb_free_frag(data); return -ENOMEM; + } } rxd->rxd1 = (unsigned int)dma_addr; ring->data[i] = data;
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: 23233e577ef9 ("net: ethernet: mtk_eth_soc: rely on page_pool for single page buffers") Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com> --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)