net: ipv6: rpl_iptunnel: Fix potential memory leak in rpl_do_srh_inline

In case memory resources for buf were allocated, release them before
return.

Addresses-Coverity-ID: 1492011 ("Resource leak")
Fixes: a7a29f9c361f ("net: ipv6: add rpl sr tunnel")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/rpl_iptunnel.c b/net/ipv6/rpl_iptunnel.c
index 203037afe0017c153eb0ad61c105a4a3d6d273f5..a49ddc6cd020dce6005faddbebfc29a30501acf1 100644 (file)
--- a/net/ipv6/rpl_iptunnel.c
+++ b/net/ipv6/rpl_iptunnel.c
@@ -155,8 +155,10 @@ static int rpl_do_srh_inline(struct sk_buff *skb, const struct rpl_lwt *rlwt,
        hdrlen = ((csrh->hdrlen + 1) << 3);
 
        err = skb_cow_head(skb, hdrlen + skb->mac_len);
-       if (unlikely(err))
+       if (unlikely(err)) {
+               kfree(buf);
                return err;
+       }
 
        skb_pull(skb, sizeof(struct ipv6hdr));
        skb_postpull_rcsum(skb, skb_network_header(skb),