From: roy.qing.li@gmail.com
To: netdev@vger.kernel.org
Cc: steffen.klassert@secunet.com
Subject: [PATCH 2/2] xfrm6: fix a potential use after free in xfrm6_policy.c
Date: Mon, 20 Oct 2014 16:49:14 +0800 [thread overview]
Message-ID: <1413794954-16967-2-git-send-email-roy.qing.li@gmail.com> (raw)
In-Reply-To: <1413794954-16967-1-git-send-email-roy.qing.li@gmail.com>
From: Li RongQing <roy.qing.li@gmail.com>
pskb_may_pull() maybe change skb->data and make nh and exthdr pointer
oboslete, so recompute the nd and exthdr
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
---
net/ipv6/xfrm6_policy.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index ac49f84..115fd3b 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -170,8 +170,10 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
case IPPROTO_DCCP:
if (!onlyproto && (nh + offset + 4 < skb->data ||
pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
- __be16 *ports = (__be16 *)exthdr;
+ __be16 *ports;
+ nh = skb_network_header(skb);
+ ports = (__be16*)(nh + offset);
fl6->fl6_sport = ports[!!reverse];
fl6->fl6_dport = ports[!reverse];
}
@@ -180,8 +182,10 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
case IPPROTO_ICMPV6:
if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
- u8 *icmp = (u8 *)exthdr;
+ u8 *icmp;
+ nh = skb_network_header(skb);
+ icmp = (u8*)(nh + offset);
fl6->fl6_icmp_type = icmp[0];
fl6->fl6_icmp_code = icmp[1];
}
@@ -192,8 +196,9 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
case IPPROTO_MH:
if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
struct ip6_mh *mh;
- mh = (struct ip6_mh *)exthdr;
+ nh = skb_network_header(skb);
+ mh = (struct ip6_mh*)(nh + offset);
fl6->fl6_mh_type = mh->ip6mh_type;
}
fl6->flowi6_proto = nexthdr;
--
1.7.10.4
next prev parent reply other threads:[~2014-10-20 8:49 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-20 8:49 [PATCH 1/2] xfrm: fix a potential use after free in xfrm4_policy.c roy.qing.li
2014-10-20 8:49 ` roy.qing.li [this message]
2014-10-20 10:36 ` [PATCH 2/2] xfrm6: fix a potential use after free in xfrm6_policy.c Sergei Shtylyov
2014-10-22 1:42 ` [PATCH 1/2] xfrm: fix a potential use after free in xfrm4_policy.c David Miller
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