Messages in this thread Patch in this message | | | From | Ben Hutchings <> | Date | Mon, 14 Nov 2016 00:14:20 +0000 | Subject | [PATCH 3.16 035/346] batman-adv: Avoid nullptr dereference in dat after vlan_insert_tag |
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3.16.39-rc1 review patch. If anyone has any objections, please let me know.
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From: Sven Eckelmann <sven@narfation.org>
commit 60154a1e0495ffb8343a95cefe1e874634572fa8 upstream.
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> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- net/batman-adv/distributed-arp-table.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
--- a/net/batman-adv/distributed-arp-table.c +++ b/net/batman-adv/distributed-arp-table.c @@ -959,9 +959,12 @@ bool batadv_dat_snoop_outgoing_arp_reque 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, @@ -1039,9 +1042,12 @@ bool batadv_dat_snoop_incoming_arp_reque */ 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
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