[PATCH v2] netfilter: nf_conntrack_bridge: Fix memory leak when error

It should be added kfree_skb_list() when err is not equal to zero
in nf_br_ip_fragment().

v2: keep this aligned with IPv6.

Fixes: 3c171f496ef5 ("netfilter: bridge: add connection tracking system")
Signed-off-by: Yajun Deng <redacted>
---
 net/bridge/netfilter/nf_conntrack_bridge.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/bridge/netfilter/nf_conntrack_bridge.c b/net/bridge/netfilter/nf_conntrack_bridge.c
index 8d033a75a766..3cf5457919c6 100644
--- a/net/bridge/netfilter/nf_conntrack_bridge.c
+++ b/net/bridge/netfilter/nf_conntrack_bridge.c

@@ -88,6 +88,11 @@ static int nf_br_ip_fragment(struct net *net, struct sock *sk,
 
 			skb = ip_fraglist_next(&iter);
 		}
+
+		if (!err)
+			return 0;
+
+		kfree_skb_list(iter.frag_list);