This is a note to let you know that I've just added the patch titled
macvtap: fix TUNSETSNDBUF values > 64k
to the 4.1-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-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Wed Sep 30 05:18:31 CEST 2015
From: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Date: Fri, 18 Sep 2015 13:41:09 +0300
Subject: macvtap: fix TUNSETSNDBUF values > 64k
From: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
[ 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@xxxxxxxxxxxxx>
Fixes: 39ec7de7092b ("macvtap: fix uninitialized access on TUNSETIFF")
Reported-by: Mark A. Peloquin
Bisected-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxxxxxxx>
Reported-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Tested-by: Matthew Rosato <mjrosato@xxxxxxxxxxxxxxxxxx>
Acked-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/macvtap.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -1054,10 +1054,10 @@ 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@xxxxxxxxxx are
queue-4.1/macvtap-fix-tunsetsndbuf-values-64k.patch
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