batman-adv: check return value of pskb_trim_rcsum()

Reported-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Acked-by: Martin Hundebøll <martin@hundeboll.net>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>

diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c
index f7c54305a9188f83dbd02af6eae287247854babf..e84629ece9b7cfb0a06a0baf856474173f02a144 100644 (file)
--- a/net/batman-adv/network-coding.c
+++ b/net/batman-adv/network-coding.c
@@ -1514,6 +1514,7 @@ batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb,
        struct ethhdr *ethhdr, ethhdr_tmp;
        uint8_t *orig_dest, ttl, ttvn;
        unsigned int coding_len;
+       int err;
 
        /* Save headers temporarily */
        memcpy(&coded_packet_tmp, skb->data, sizeof(coded_packet_tmp));
@@ -1568,8 +1569,11 @@ batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb,
                         coding_len);
 
        /* Resize decoded skb if decoded with larger packet */
-       if (nc_packet->skb->len > coding_len + h_size)
-               pskb_trim_rcsum(skb, coding_len + h_size);
+       if (nc_packet->skb->len > coding_len + h_size) {
+               err = pskb_trim_rcsum(skb, coding_len + h_size);
+               if (err)
+                       return NULL;
+       }
 
        /* Create decoded unicast packet */
        unicast_packet = (struct batadv_unicast_packet *)skb->data;