[PATCH] sctp: fix incorrect overflow check on autoclose

[Xi Wang <xi.wang@xxxxxxxxx>]

The commit 8ffd3208 voids the previous patches f6778aab and 810c0719
for limiting the maximum autoclose value.  If userspace passes in -1
on 32-bit platform, the overflow check didn't work and autoclose
would be set to 0xffffffff.

CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Andrei Pelinescu-Onciul <andrei@xxxxxxxxx>
Cc: Vlad Yasevich <vladislav.yasevich@xxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Xi Wang <xi.wang@xxxxxxxxx>
---
 net/sctp/socket.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 13bf5fc..bb91281 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2201,7 +2201,8 @@ static int sctp_setsockopt_autoclose(struct sock *sk, char __user *optval,
 	if (copy_from_user(&sp->autoclose, optval, optlen))
 		return -EFAULT;
 	/* make sure it won't exceed MAX_SCHEDULE_TIMEOUT */
-	sp->autoclose = min_t(long, sp->autoclose, MAX_SCHEDULE_TIMEOUT / HZ);
+	sp->autoclose = min_t(unsigned long, sp->autoclose,
+			      MAX_SCHEDULE_TIMEOUT / HZ);
 
 	return 0;
 }
-- 
1.7.5.4

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