Patch "macvtap: fix TUNSETSNDBUF values > 64k" has been added to the 4.2-stable tree

Patch "macvtap: fix TUNSETSNDBUF values > 64k" has been added to the 4.2-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    macvtap: fix TUNSETSNDBUF values > 64k

to the 4.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     macvtap-fix-tunsetsndbuf-values-64k.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Wed Sep 30 05:25:07 CEST 2015
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: Fri, 18 Sep 2015 13:41:09 +0300
Subject: macvtap: fix TUNSETSNDBUF values > 64k

From: "Michael S. Tsirkin" <mst@redhat.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@davemloft.net>
Fixes: 39ec7de7092b ("macvtap: fix uninitialized access on TUNSETIFF")
Reported-by: Mark A. Peloquin
Bisected-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by:  Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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:


Patches currently in stable-queue which might be from mst@redhat.com are

queue-4.2/macvtap-fix-tunsetsndbuf-values-64k.patch