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Commit 3805a938 authored by Eric Garver's avatar Eric Garver Committed by David S. Miller
Browse files

flow_dissector: Check skb for VLAN only if skb specified. 



Fixes a panic when calling eth_get_headlen(). Noticed on i40e driver.

Fixes: d5709f7a ("flow_dissector: For stripped vlan, get vlan info from skb->vlan_tci")
Signed-off-by: default avatarEric Garver <e@erig.me>
Reviewed-by: default avatarJakub Sitnicki <jkbs@redhat.com>
Acked-by: default avatarAmir Vadai <amir@vadai.me>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b4f0fd4b

net/core/flow_dissector.c

+2 −4
Original line number Diff line number Diff line
@@ -247,12 +247,10 @@ bool __skb_flow_dissect(const struct sk_buff *skb, 
	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),