From: Wei Yongjun <yjwei@cn.fujitsu.com>
Date: Mon, 2 Mar 2009 09:46:12 +0000 (+0000)
Subject: sctp: fix the length check in sctp_getsockopt_maxburst()
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=c6db93a58f1745cfe1acc2e1a1d68afc3245eced;p=openwrt%2Fstaging%2Fblogic.git

sctp: fix the length check in sctp_getsockopt_maxburst()

The code in sctp_getsockopt_maxburst() doesn't allow len to be larger
then struct sctp_assoc_value, which is a common case where app writers
just pass down the sizeof(buf) or something similar.

This patch fix the problem.

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

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 4bc558c19fcf..bbd3cd238d7f 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5286,7 +5286,8 @@ static int sctp_getsockopt_maxburst(struct sock *sk, int len,
 		printk(KERN_WARNING
 		   "SCTP: Use struct sctp_assoc_value instead\n");
 		params.assoc_id = 0;
-	} else if (len == sizeof (struct sctp_assoc_value)) {
+	} else if (len >= sizeof(struct sctp_assoc_value)) {
+		len = sizeof(struct sctp_assoc_value);
 		if (copy_from_user(&params, optval, len))
 			return -EFAULT;
 	} else