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(parent: 6df7aad) | patch
virtio: console: Prevent userspace from submitting NULL buffers
authorAmit Shah <amit.shah@redhat.com>
Tue, 14 Sep 2010 07:56:16 +0000 (13:26 +0530)
committerRusty Russell <rusty@rustcorp.com.au>
Tue, 21 Sep 2010 01:24:01 +0000 (10:54 +0930)
commit65745422a898741ee0e7068ef06624ab06e8aefa
treeadee25ae37886d79f8319ce69673a75036423c28tree | snapshot (tar.gz zip)
parent6df7aadcd9290807c464675098b5dd2dc9da5075commit | diff
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
drivers/char/virtio_console.c diff | blob | blame | history