tree adee25ae37886d79f8319ce69673a75036423c28
parent 6df7aadcd9290807c464675098b5dd2dc9da5075
author Amit Shah <amit.shah@redhat.com> 1284450976 +0530
committer Rusty Russell <rusty@rustcorp.com.au> 1285032241 +0930

virtio: console: Prevent userspace from submitting NULL buffers

A userspace could submit a buffer with 0 length to be written to the
host.  Prevent such a situation.

This was not needed previously, but recent changes in the way write()
works exposed this condition to trigger a virtqueue event to the host,
causing a NULL buffer to be sent across.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
CC: stable@kernel.org