batman-adv: Avoid nullptr dereference in bla after vlan_insert_tag
vlan_insert_tag can return NULL on errors. The bridge loop avoidance code
therefore has to check the return value of vlan_insert_tag for NULL before
it can safely operate on this pointer.
Fixes: 23721387c4
("batman-adv: add basic bridge loop avoidance code")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
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@ -418,9 +418,12 @@ static void batadv_bla_send_claim(struct batadv_priv *bat_priv, u8 *mac,
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break;
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}
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if (vid & BATADV_VLAN_HAS_TAG)
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if (vid & BATADV_VLAN_HAS_TAG) {
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skb = vlan_insert_tag(skb, htons(ETH_P_8021Q),
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vid & VLAN_VID_MASK);
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if (!skb)
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goto out;
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}
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skb_reset_mac_header(skb);
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skb->protocol = eth_type_trans(skb, soft_iface);
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