From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steffen Klassert Subject: [PATCH 3/3] xfrm: Fix null pointer dereference when decoding sessions Date: Fri, 1 Nov 2013 09:21:47 +0100 Message-ID: <1383294107-7509-4-git-send-email-steffen.klassert@secunet.com> References: <1383294107-7509-1-git-send-email-steffen.klassert@secunet.com> Cc: Herbert Xu , Steffen Klassert , netdev@vger.kernel.org To: David Miller Return-path: Received: from a.mx.secunet.com ([195.81.216.161]:49483 "EHLO a.mx.secunet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753798Ab3KAIVy (ORCPT ); Fri, 1 Nov 2013 04:21:54 -0400 In-Reply-To: <1383294107-7509-1-git-send-email-steffen.klassert@secunet.com> Sender: netdev-owner@vger.kernel.org List-ID: On some codepaths the skb does not have a dst entry when xfrm_decode_session() is called. So check for a valid skb_dst() before dereferencing the device interface index. We use 0 as the device index if there is no valid skb_dst(), or at reverse decoding we use skb_iif as device interface index. Bug was introduced with git commit bafd4bd4dc ("xfrm: Decode sessions with output interface."). Reported-by: Meelis Roos Tested-by: Meelis Roos Signed-off-by: Steffen Klassert --- net/ipv4/xfrm4_policy.c | 6 +++++- net/ipv6/xfrm6_policy.c | 6 +++++- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c index 4764ee4..e1a6393 100644 --- a/net/ipv4/xfrm4_policy.c +++ b/net/ipv4/xfrm4_policy.c @@ -104,10 +104,14 @@ _decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse) const struct iphdr *iph = ip_hdr(skb); u8 *xprth = skb_network_header(skb) + iph->ihl * 4; struct flowi4 *fl4 = &fl->u.ip4; + int oif = 0; + + if (skb_dst(skb)) + oif = skb_dst(skb)->dev->ifindex; memset(fl4, 0, sizeof(struct flowi4)); fl4->flowi4_mark = skb->mark; - fl4->flowi4_oif = skb_dst(skb)->dev->ifindex; + fl4->flowi4_oif = reverse ? skb->skb_iif : oif; if (!ip_is_fragment(iph)) { switch (iph->protocol) { diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c index dd503a3..5f8e128 100644 --- a/net/ipv6/xfrm6_policy.c +++ b/net/ipv6/xfrm6_policy.c @@ -135,10 +135,14 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse) struct ipv6_opt_hdr *exthdr; const unsigned char *nh = skb_network_header(skb); u8 nexthdr = nh[IP6CB(skb)->nhoff]; + int oif = 0; + + if (skb_dst(skb)) + oif = skb_dst(skb)->dev->ifindex; memset(fl6, 0, sizeof(struct flowi6)); fl6->flowi6_mark = skb->mark; - fl6->flowi6_oif = skb_dst(skb)->dev->ifindex; + fl6->flowi6_oif = reverse ? skb->skb_iif : oif; fl6->daddr = reverse ? hdr->saddr : hdr->daddr; fl6->saddr = reverse ? hdr->daddr : hdr->saddr; -- 1.7.9.5