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batman-adv: retrieve ethhdr after potential skb realloc on RX

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pskb_may_pull() in batadv_interface_rx() could reallocate the buffer behind
the skb. Variables which were pointing to the old buffer need to be
reassigned to avoid an use-after-free.

This was done correctly for the VLAN header but missed for the ethernet
header which is later used for the TT and AP isolation handling.

Cc: stable@vger.kernel.org
Reported-by: Sashiko <sashiko-bot@kernel.org>
Fixes: c6c8fea297 ("net: Add batman-adv meshing protocol")
Fixes: c78296665c ("batman-adv: Check skb size before using encapsulated ETH+VLAN header")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
This commit is contained in:
Sven Eckelmann 2026-06-28 06:44:13 +02:00
parent 805185b7c7
commit 035e1fed89
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1 changed files with 1 additions and 0 deletions
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net/batman-adv/mesh-interface.c
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@ -434,6 +434,7 @@ void batadv_interface_rx(struct net_device *mesh_iface,
if (!pskb_may_pull(skb, VLAN_ETH_HLEN))
goto dropped;
ethhdr = eth_hdr(skb);
vhdr = skb_vlan_eth_hdr(skb);
/* drop batman-in-batman packets to prevent loops */