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batman-adv: gw: acquire ethernet header only after skb realloc

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commit 77880a3be8 upstream.

The pskb_may_pull() called by batadv_get_vid() 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.

Cc: stable@vger.kernel.org
Fixes: 6c413b1c22 ("batman-adv: send every DHCP packet as bat-unicast")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sven Eckelmann
2026-07-24 16:03:33 +02:00
committed by Greg Kroah-Hartman
parent 27206bb57c
commit afac8096bd
1 changed files with 2 additions and 1 deletions
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net/batman-adv/gateway_client.c
+2 -1
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@@ -693,12 +693,13 @@ bool batadv_gw_out_of_range(struct batadv_priv *bat_priv,
struct batadv_gw_node *gw_node = NULL;
struct batadv_gw_node *curr_gw = NULL;
struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo;
struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
struct ethhdr *ethhdr;
bool out_of_range = false;
u8 curr_tq_avg;
unsigned short vid;
vid = batadv_get_vid(skb, 0);
ethhdr = (struct ethhdr *)skb->data;
if (is_multicast_ether_addr(ethhdr->h_dest))
goto out;