3.16.74-rc1 review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@oracle.com
commit dd6e2a981bfe83aa4a493143fd8cf1edcda6c091 upstream.
The "b->index" is a u32 the comes from the user in the ioctl. It hasn't been checked. We aren't supposed to use it but we're instead supposed to use the value that gets written to it when we call videobuf_dqbuf().
The videobuf_dqbuf() first memsets it to zero and then re-initializes it inside the videobuf_status() function. It's this final value which we want.
Hans Verkuil pointed out that we need to check the return from videobuf_dqbuf(). I ended up doing a little cleanup related to that as well.
Fixes: 72915e851da9 ("[media] V4L2: OMAP: VOUT: dma map and unmap v4l2 buffers in qbuf and dqbuf")
Signed-off-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/media/platform/omap/omap_vout.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-)
--- a/drivers/media/platform/omap/omap_vout.c +++ b/drivers/media/platform/omap/omap_vout.c @@ -1596,23 +1596,20 @@ static int vidioc_dqbuf(struct file *fil unsigned long size; struct videobuf_buffer *vb;
- vb = q->bufs[b->index]; - if (!vout->streaming) return -EINVAL;
- if (file->f_flags & O_NONBLOCK) - /* Call videobuf_dqbuf for non blocking mode */ - ret = videobuf_dqbuf(q, (struct v4l2_buffer *)b, 1); - else - /* Call videobuf_dqbuf for blocking mode */ - ret = videobuf_dqbuf(q, (struct v4l2_buffer *)b, 0); + ret = videobuf_dqbuf(q, b, !!(file->f_flags & O_NONBLOCK)); + if (ret) + return ret; + + vb = q->bufs[b->index];
addr = (unsigned long) vout->buf_phy_addr[vb->i]; size = (unsigned long) vb->size; dma_unmap_single(vout->vid_dev->v4l2_dev.dev, addr, size, DMA_TO_DEVICE); - return ret; + return 0; }
static int vidioc_streamon(struct file *file, void *fh, enum v4l2_buf_type i)