[PATCH batadv] batman-adv: fix VLAN priority offset

The batadv_skb_set_priority() receives an SKB with the inner ethernet
header at position "offset". When it tries to extract the IPv4 and IPv6
header, it needs to skip the ethernet header to get access to the IP
header.

But for VLAN header, it performs the access with the struct vlan_ethhdr.
This struct contains both both the ethernet header and the VLAN header. It
is therefore incorrect to skip over the whole vlan_ethhdr size to get
access to the vlan_ethhdr.

Fixes: eb7643628a60 ("batman-adv: set skb priority according to content")
Signed-off-by: Sven Eckelmann <[email protected]>
---
 net/batman-adv/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index 23abe04b..4dc4df3a 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -380,7 +380,7 @@ void batadv_skb_set_priority(struct sk_buff *skb, int offset)
 
 	switch (ethhdr->h_proto) {
 	case htons(ETH_P_8021Q):
-		vhdr = skb_header_pointer(skb, offset + sizeof(*vhdr),
+		vhdr = skb_header_pointer(skb, offset,
 					  sizeof(*vhdr), &vhdr_tmp);
 		if (!vhdr)
 			return;

---
base-commit: 9bd026856d0c9680390b1a1a42ae0fd44532c3d4
change-id: 20260702-vlan-prio-57d4f3f186ca

Best regards,
--  
Sven Eckelmann <[email protected]>