From f674e72ff1aad23a99c7c205473cf02c85c2ac33 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Thu, 27 Sep 2012 22:21:19 +0000 Subject: 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 Signed-off-by: David S. Miller --- net/key/af_key.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'net/key/af_key.c') diff --git a/net/key/af_key.c b/net/key/af_key.c index 2ca7d7f6861c..08897a3c7ec7 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; -- cgit v1.2.3