From 25a685d20e45eec5233fe1d67d9afe31983585b7 Mon Sep 17 00:00:00 2001 From: Sergey Popovich Date: Thu, 8 May 2014 16:22:35 +0300 Subject: [PATCH] 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: 58e35d147128 netfilter: ipv6: propagate routing errors from ip6_route_me_harder() Signed-off-by: Sergey Popovich Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- net/ipv6/netfilter.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c index 95f3f1d..d38e6a8 100644 --- a/net/ipv6/netfilter.c +++ b/net/ipv6/netfilter.c @@ -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. */ -- 2.7.4