macvtap: fix TUNSETSNDBUF values > 64k

Upon TUNSETSNDBUF,  macvtap reads the requested sndbuf size into
a local variable u.
commit 39ec7de ("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 <[email protected]>
Fixes: 39ec7de ("macvtap: fix uninitialized access on TUNSETIFF")
Reported-by: Mark A. Peloquin
Bisected-by: Matthew Rosato <[email protected]>
Reported-by: Christian Borntraeger <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
Tested-by:  Matthew Rosato <[email protected]>
Acked-by: Christian Borntraeger <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: mstsirkin

drivers/net/macvtap.c

@@ -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: