netdev - [patch] sctp: check len in sctp_getsockopt_assoc

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Message-ID: <20130227204144.GA11300@longonot.mountain>
Date:	Wed, 27 Feb 2013 23:41:44 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Vlad Yasevich <vyasevich@...il.com>,
	Michele Baldessari <michele@...syn.org>
Cc:	Sridhar Samudrala <sri@...ibm.com>,
	Neil Horman <nhorman@...driver.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [patch] sctp: check len in sctp_getsockopt_assoc_stats()

This check is missing an upper bound.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
This should go in 3.8 -stable as well.

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index c99458d..fbd8386 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5652,6 +5652,8 @@ static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
 	/* User must provide at least the assoc id */
 	if (len < sizeof(sctp_assoc_t))
 		return -EINVAL;
+	if (len > sizeof(struct sctp_assoc_stats))
+		len = sizeof(struct sctp_assoc_stats);
 
 	if (copy_from_user(&sas, optval, len))
 		return -EFAULT;
--
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