[PATCH] net/sctp: Validate parameter size for SCTP_GET_ASSOC_STATS

[Luis Henriques]

From: Guenter Roeck <linux at roeck-us.net>

CVE-2013-1828

BugLink: http://bugs.launchpad.net/bugs/1152791

Building sctp may fail with:

In function ‘copy_from_user’,
    inlined from ‘sctp_getsockopt_assoc_stats’ at
    net/sctp/socket.c:5656:20:
arch/x86/include/asm/uaccess_32.h:211:26: error: call to
    ‘copy_from_user_overflow’ declared with attribute error: copy_from_user()
    buffer size is not provably correct

if built with W=1 due to a missing parameter size validation
before the call to copy_from_user.

Signed-off-by: Guenter Roeck <linux at roeck-us.net>
Acked-by: Vlad Yasevich <vyasevich at gmail.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit 726bc6b092da4c093eb74d13c07184b18c1af0f1)

Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 net/sctp/socket.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index cedd9bf..9ef5c73 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5653,6 +5653,9 @@ static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
 	if (len < sizeof(sctp_assoc_t))
 		return -EINVAL;
 
+	/* Allow the struct to grow and fill in as much as possible */
+	len = min_t(size_t, len, sizeof(sas));
+
 	if (copy_from_user(&sas, optval, len))
 		return -EFAULT;
 
@@ -5686,9 +5689,6 @@ static int sctp_getsockopt_assoc_stats(struct sock *sk, int len,
 	/* Mark beginning of a new observation period */
 	asoc->stats.max_obs_rto = asoc->rto_min;
 
-	/* Allow the struct to grow and fill in as much as possible */
-	len = min_t(size_t, len, sizeof(sas));
-
 	if (put_user(len, optlen))
 		return -EFAULT;
 
-- 
1.7.9.5