From f674e72ff1aad23a99c7c205473cf02c85c2ac33 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 27 Sep 2012 22:21:19 +0000
Subject: [PATCH] net/key/af_key.c: add range checks on ->sadb_x_policy_len
Because sizeof() is size_t then if "len" is negative, it counts as a
large positive value.
The call tree looks like:
pfkey_sendmsg()
-> pfkey_process()
-> pfkey_spdadd()
-> parse_ipsecrequests()
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/key/af_key.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 2ca7d7f6861c0..08897a3c7ec76 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1923,6 +1923,9 @@ parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy);
struct sadb_x_ipsecrequest *rq = (void*)(pol+1);
+ if (pol->sadb_x_policy_len * 8 < sizeof(struct sadb_x_policy))
+ return -EINVAL;
+
while (len >= sizeof(struct sadb_x_ipsecrequest)) {
if ((err = parse_ipsecrequest(xp, rq)) < 0)
return err;