From: Timo Teräs <timo.teras@iki.fi>
Date: Wed, 31 Mar 2010 00:17:04 +0000 (+0000)
Subject: xfrm_user: verify policy direction at XFRM_MSG_POLEXPIRE handler
X-Git-Tag: firefly_0821_release~9833^2~2087^2~622
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c8bf4d04f970fafb3430d332533e1cf103f2a018;p=firefly-linux-kernel-4.4.55.git

xfrm_user: verify policy direction at XFRM_MSG_POLEXPIRE handler

Add missing check for policy direction verification. This is
especially important since without this xfrm_user may end up
deleting per-socket policy which is not allowed.

Signed-off-by: Timo Teras <timo.teras@iki.fi>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 6106b72826d3..da5ba86181de 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1741,6 +1741,10 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (err)
 		return err;
 
+	err = verify_policy_dir(p->dir);
+	if (err)
+		return err;
+
 	if (p->index)
 		xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
 	else {