[ Upstream commit 0318a7b7fcad9765931146efa7ca3a034194737c ]
In the two places is_last_ethertype_ip is being called, the caller will be looking inside the ip header, to be safe, add ip{4,6} header sanity check. And return true only on valid ip headers, i.e: the whole header is contained in the linear part of the skb.
Note: Such situation is very rare and hard to reproduce, since mlx5e allocates a large enough headroom to contain the largest header one can imagine.
Fixes: fe1dc069990c ("net/mlx5e: don't set CHECKSUM_COMPLETE on SCTP packets") Reported-by: Cong Wang xiyou.wangcong@gmail.com Reviewed-by: Tariq Toukan tariqt@mellanox.com Signed-off-by: Saeed Mahameed saeedm@mellanox.com --- drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c index 318fee09f049..df49dc143c47 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c @@ -694,7 +694,14 @@ static inline bool is_last_ethertype_ip(struct sk_buff *skb, int *network_depth, { *proto = ((struct ethhdr *)skb->data)->h_proto; *proto = __vlan_get_protocol(skb, *proto, network_depth); - return (*proto == htons(ETH_P_IP) || *proto == htons(ETH_P_IPV6)); + + if (*proto == htons(ETH_P_IP)) + return pskb_may_pull(skb, *network_depth + sizeof(struct iphdr)); + + if (*proto == htons(ETH_P_IPV6)) + return pskb_may_pull(skb, *network_depth + sizeof(struct ipv6hdr)); + + return false; }
static inline void mlx5e_enable_ecn(struct mlx5e_rq *rq, struct sk_buff *skb)