net:ipv6: check return value of pskb_trim()

goto tx_err if an unexpected result is returned by pskb_tirm()
in ip6erspan_tunnel_xmit().

Fixes: 5a963eb61b7c ("ip6_gre: Add ERSPAN native tunnel support")
Signed-off-by: Yuanjun Gong <ruc_gongyuanjun@163.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index da80974ad23aeb9751e325b28f0dc293f48bf6a1..070d87abf7c0284aa23043391aab080534e144a7 100644 (file)
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -955,7 +955,8 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
                goto tx_err;
 
        if (skb->len > dev->mtu + dev->hard_header_len) {
-               pskb_trim(skb, dev->mtu + dev->hard_header_len);
+               if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
+                       goto tx_err;
                truncate = true;
        }