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macvtap: fix TUNSETSNDBUF values > 64k

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Upon TUNSETSNDBUF,  macvtap reads the requested sndbuf size into
a local variable u.
commit 39ec7de709 ("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: 39ec7de709 ("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>
This commit is contained in:
Michael S. Tsirkin 2015-09-18 13:41:09 +03:00 committed by David S. Miller
parent 83cf9a2521
commit 3ea79249e8
1 changed files with 2 additions and 2 deletions
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4
drivers/net/macvtap.c
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@ -1111,10 +1111,10 @@ static long macvtap_ioctl(struct file *file, unsigned int cmd,
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: