flow_dissector: Check skb for VLAN only if skb specified.
authorEric Garver <e@erig.me>
Mon, 17 Oct 2016 20:30:12 +0000 (16:30 -0400)
committerDavid S. Miller <davem@davemloft.net>
Wed, 19 Oct 2016 14:35:46 +0000 (10:35 -0400)
Fixes a panic when calling eth_get_headlen(). Noticed on i40e driver.

Fixes: d5709f7ab776 ("flow_dissector: For stripped vlan, get vlan info from skb->vlan_tci")
Signed-off-by: Eric Garver <e@erig.me>
Reviewed-by: Jakub Sitnicki <jkbs@redhat.com>
Acked-by: Amir Vadai <amir@vadai.me>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/flow_dissector.c

index 1a7b80f733764770c3ac44853314eec2837c0abd..44e6ba9d3a6b280f5d5f295668f2343e8573c567 100644 (file)
@@ -247,12 +247,10 @@ ipv6:
        case htons(ETH_P_8021Q): {
                const struct vlan_hdr *vlan;
 
-               if (skb_vlan_tag_present(skb))
+               if (skb && skb_vlan_tag_present(skb))
                        proto = skb->protocol;
 
-               if (!skb_vlan_tag_present(skb) ||
-                   proto == cpu_to_be16(ETH_P_8021Q) ||
-                   proto == cpu_to_be16(ETH_P_8021AD)) {
+               if (eth_type_vlan(proto)) {
                        struct vlan_hdr _vlan;
 
                        vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),