From: Joe Stringer Date: Mon, 26 Oct 2015 03:21:50 +0000 (-0700) Subject: openvswitch: Fix skb leak using IPv6 defrag X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6f5cadee44d83395dcd78d557b577e1021e192e4;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git openvswitch: Fix skb leak using IPv6 defrag nf_ct_frag6_gather() makes a clone of each skb passed to it, and if the reassembly is successful, expects the caller to free all of the original skbs using nf_ct_frag6_consume_orig(). This call was previously missing, meaning that the original fragments were never freed (with the exception of the last fragment to arrive). Fix this by ensuring that all original fragments except for the last fragment are freed via nf_ct_frag6_consume_orig(). The last fragment will be morphed into the head, so it must not be freed yet. Furthermore, retain the ->next pointer for the head after skb_morph(). Fixes: 7f8a436eaa2c ("openvswitch: Add conntrack action") Reported-by: Florian Westphal Signed-off-by: Joe Stringer Acked-by: Pravin B Shelar Signed-off-by: David S. Miller --- diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c index b5dcc0abde66..50095820edb7 100644 --- a/net/openvswitch/conntrack.c +++ b/net/openvswitch/conntrack.c @@ -326,8 +326,15 @@ static int handle_fragments(struct net *net, struct sw_flow_key *key, return -EINVAL; } + /* Don't free 'skb' even though it is one of the original + * fragments, as we're going to morph it into the head. + */ + skb_get(skb); + nf_ct_frag6_consume_orig(reasm); + key->ip.proto = ipv6_hdr(reasm)->nexthdr; skb_morph(skb, reasm); + skb->next = reasm->next; consume_skb(reasm); ovs_cb.mru = IP6CB(skb)->frag_max_size; #endif