From: Vlad Yasevich <vladislav.yasevich@hp.com>
Date: Wed, 27 Aug 2008 23:09:49 +0000 (-0700)
Subject: sctp: fix random memory dereference with SCTP_HMAC_IDENT option.
X-Git-Tag: v2.6.27-rc5~8^2
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d97240552cd98c4b07322f30f66fd9c3ba4171de;p=linux-2.6

sctp: fix random memory dereference with SCTP_HMAC_IDENT option.

The number of identifiers needs to be checked against the option
length.  Also, the identifier index provided needs to be verified
to make sure that it doesn't exceed the bounds of the array.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/sctp/auth.c b/net/sctp/auth.c
index 1fcb4cf2f4..52db5f60da 100644
--- a/net/sctp/auth.c
+++ b/net/sctp/auth.c
@@ -786,6 +786,9 @@ int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep,
 	for (i = 0; i < hmacs->shmac_num_idents; i++) {
 		id = hmacs->shmac_idents[i];
 
+		if (id > SCTP_AUTH_HMAC_ID_MAX)
+			return -EOPNOTSUPP;
+
 		if (SCTP_AUTH_HMAC_ID_SHA1 == id)
 			has_sha1 = 1;
 
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 9b9b2c31dd..5ffb9dec1c 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3086,6 +3086,7 @@ static int sctp_setsockopt_hmac_ident(struct sock *sk,
 				    int optlen)
 {
 	struct sctp_hmacalgo *hmacs;
+	u32 idents;
 	int err;
 
 	if (!sctp_auth_enable)
@@ -3103,8 +3104,9 @@ static int sctp_setsockopt_hmac_ident(struct sock *sk,
 		goto out;
 	}
 
-	if (hmacs->shmac_num_idents == 0 ||
-	    hmacs->shmac_num_idents > SCTP_AUTH_NUM_HMACS) {
+	idents = hmacs->shmac_num_idents;
+	if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS ||
+	    (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) {
 		err = -EINVAL;
 		goto out;
 	}