diff options
| author | Sven Eckelmann <sven@narfation.org> | 2016-07-02 10:52:14 +0300 |
|---|---|---|
| committer | Simon Wunderlich <sw@simonwunderlich.de> | 2016-07-05 13:40:01 +0300 |
| commit | 60154a1e0495ffb8343a95cefe1e874634572fa8 (patch) | |
| tree | 254fdeb46565e5e8e7f56782f60cfc713ebdffcc | |
| parent | 10c78f5854d361ded4736c1831948e0a5f67b932 (diff) | |
| download | linux-60154a1e0495ffb8343a95cefe1e874634572fa8.tar.xz | |
batman-adv: Avoid nullptr dereference in dat after vlan_insert_tag
vlan_insert_tag can return NULL on errors. The distributed arp table code
therefore has to check the return value of vlan_insert_tag for NULL before
it can safely operate on this pointer.
Fixes: be1db4f6615b ("batman-adv: make the Distributed ARP Table vlan aware")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
| -rw-r--r-- | net/batman-adv/distributed-arp-table.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c index 278800a99c69..aee3b3991471 100644 --- a/net/batman-adv/distributed-arp-table.c +++ b/net/batman-adv/distributed-arp-table.c @@ -1009,9 +1009,12 @@ bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv, if (!skb_new) goto out; - if (vid & BATADV_VLAN_HAS_TAG) + if (vid & BATADV_VLAN_HAS_TAG) { skb_new = vlan_insert_tag(skb_new, htons(ETH_P_8021Q), vid & VLAN_VID_MASK); + if (!skb_new) + goto out; + } skb_reset_mac_header(skb_new); skb_new->protocol = eth_type_trans(skb_new, @@ -1089,9 +1092,12 @@ bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv, */ skb_reset_mac_header(skb_new); - if (vid & BATADV_VLAN_HAS_TAG) + if (vid & BATADV_VLAN_HAS_TAG) { skb_new = vlan_insert_tag(skb_new, htons(ETH_P_8021Q), vid & VLAN_VID_MASK); + if (!skb_new) + goto out; + } /* To preserve backwards compatibility, the node has choose the outgoing * format based on the incoming request packet type. The assumption is |