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>

1 files changed, 6 insertions, 2 deletions

diff --git a/net/batman-adv/network-coding.c b/net/batman-adv/network-coding.c
index f7c54305a918..e84629ece9b7 100644
--- 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;