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>
---
drivers/net/ethernet/dlink/dl2k.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
---
Changelog:
v4:
- consolidated into a single patch
- removed goto statement, per Jakub's suggestion
- reorder changelog for clarity
v3: https://lore.kernel.org/netdev/20250916183305.2808-1-yyyynoom@gmail.com/
- change confusing label name
v2: https://lore.kernel.org/netdev/20250914182653.3152-4-yyyynoom@gmail.com/
- split into two patches: whitespace cleanup and functional fix
v1: https://lore.kernel.org/netdev/20250912145339.67448-2-yyyynoom@gmail.com/
---
diff --git a/drivers/net/ethernet/dlink/dl2k.c b/drivers/net/ethernet/dlink/dl2k.c
index 6bbf6e5584e5..1996d2e4e3e2 100644
--- a/drivers/net/ethernet/dlink/dl2k.c
+++ b/drivers/net/ethernet/dlink/dl2k.c
@@ -964,15 +964,18 @@ 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,
--
2.51.0