From: Amit Shah <amit.shah@redhat.com>
Date: Tue, 14 Sep 2010 07:56:16 +0000 (+0530)
Subject: virtio: console: Prevent userspace from submitting NULL buffers
X-Git-Tag: v2.6.36-rc6~86^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=65745422a898741ee0e7068ef06624ab06e8aefa;p=pandora-kernel.git

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
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