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netfilter: Fix potential use after free in ip6_route_me_harder() 

commit a8951d5814e1373807a94f79f7ccec7041325470 upstream.

Dst is released one line before we access it again with dst->error.

Fixes: 58e35d1471 netfilter: ipv6: propagate routing errors from
ip6_route_me_harder()

Signed-off-by: Sergey Popovich <popovich_sergei@mail.ru>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sergey Popovich 2014-05-08 16:22:35 +03:00 committed by Greg Kroah-Hartman
parent c318d7b4db
commit 25a685d20e
1 changed files with 4 additions and 2 deletions
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6
net/ipv6/netfilter.c
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@ -30,13 +30,15 @@ int ip6_route_me_harder(struct sk_buff *skb)
.daddr = iph->daddr,
.saddr = iph->saddr,
};
int err;
dst = ip6_route_output(net, skb->sk, &fl6);
if (dst->error) {
err = dst->error;
if (err) {
IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");
dst_release(dst);
return dst->error;
return err;
}
/* Drop old route. */