linux-kernel - [PATCH 4.2 16/30] macvtap: fix TUNSETSNDBUF values

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Message-Id: <20151001092038.903997237@linuxfoundation.org>
Date:	Thu,  1 Oct 2015 11:21:38 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Matthew Rosato <mjrosato@...ux.vnet.ibm.com>
Subject: [PATCH 4.2 16/30] macvtap: fix TUNSETSNDBUF values > 64k

4.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Michael S. Tsirkin" <mst@...hat.com>

[ Upstream commit 3ea79249e81e5ed051f2e6480cbde896d99046e8 ]

Upon TUNSETSNDBUF,  macvtap reads the requested sndbuf size into
a local variable u.
commit 39ec7de7092b ("macvtap: fix uninitialized access on
TUNSETIFF") changed its type to u16 (which is the right thing to
do for all other macvtap ioctls), breaking all values > 64k.

The value of TUNSETSNDBUF is actually a signed 32 bit integer, so
the right thing to do is to read it into an int.

Cc: David S. Miller <davem@...emloft.net>
Fixes: 39ec7de7092b ("macvtap: fix uninitialized access on TUNSETIFF")
Reported-by: Mark A. Peloquin
Bisected-by: Matthew Rosato <mjrosato@...ux.vnet.ibm.com>
Reported-by: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Tested-by:  Matthew Rosato <mjrosato@...ux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/macvtap.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -1111,10 +1111,10 @@ static long macvtap_ioctl(struct file *f
 		return 0;
 
 	case TUNSETSNDBUF:
-		if (get_user(u, up))
+		if (get_user(s, sp))
 			return -EFAULT;
 
-		q->sk.sk_sndbuf = u;
+		q->sk.sk_sndbuf = s;
 		return 0;
 
 	case TUNGETVNETHDRSZ:


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