From: Pawel Osciak <p.osciak@samsung.com>
Date: Tue, 20 Jul 2010 16:49:16 +0000 (-0300)
Subject: V4L/DVB: v4l: videobuf: prevent passing a NULL to dma_free_coherent()
X-Git-Tag: v2.6.36-rc8~32^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b2b476f53a9d24b00a313adf7f6ca92515a2af54;p=pandora-kernel.git

V4L/DVB: v4l: videobuf: prevent passing a NULL to dma_free_coherent()

When a driver that uses videobuf-dma-contig is used with the USERPTR
memory access method a kernel oops might happen: a NULL address may be
passed to dma_free_coherent(). This happens when an application calls
REQBUFS and then exits without queuing any buffers. This patch fixes
that bug.

Signed-off-by: Pawel Osciak <p.osciak@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---

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