6.1-stable review patch. If anyone has any objections, please let me know.
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From: Yeounsu Moon yyyynoom@gmail.com
[ Upstream commit 8169a6011c5fecc6cb1c3654c541c567d3318de8 ]
The driver did not handle failure of `netdev_alloc_skb_ip_align()`. If the allocation failed, dereferencing `skb->protocol` could lead to a NULL pointer dereference.
This patch tries to allocate `skb`. If the allocation fails, it falls back to the normal path.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Suggested-by: Jakub Kicinski kuba@kernel.org Tested-on: D-Link DGE-550T Rev-A3 Signed-off-by: Yeounsu Moon yyyynoom@gmail.com Reviewed-by: Andrew Lunn andrew@lunn.ch Link: https://patch.msgid.link/20250928190124.1156-1-yyyynoom@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/dlink/dl2k.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/dlink/dl2k.c b/drivers/net/ethernet/dlink/dl2k.c index 2acb63b547c35..bf58181589bf2 100644 --- a/drivers/net/ethernet/dlink/dl2k.c +++ b/drivers/net/ethernet/dlink/dl2k.c @@ -956,15 +956,18 @@ receive_packet (struct net_device *dev) } else { struct sk_buff *skb;
+ skb = NULL; /* Small skbuffs for short packets */ - if (pkt_len > copy_thresh) { + if (pkt_len <= copy_thresh) + skb = netdev_alloc_skb_ip_align(dev, pkt_len); + if (!skb) { dma_unmap_single(&np->pdev->dev, desc_to_dma(desc), np->rx_buf_sz, DMA_FROM_DEVICE); skb_put (skb = np->rx_skbuff[entry], pkt_len); np->rx_skbuff[entry] = NULL; - } else if ((skb = netdev_alloc_skb_ip_align(dev, pkt_len))) { + } else { dma_sync_single_for_cpu(&np->pdev->dev, desc_to_dma(desc), np->rx_buf_sz,