> -----Original Message-----
> From: Taneja, Archit
> Sent: Friday, September 16, 2011 3:30 PM
> To: Hiremath, Vaibhav
> Cc: Valkeinen, Tomi; linux-omap@xxxxxxxxxxxxxxx; Semwal, Sumit; linux-
> media@xxxxxxxxxxxxxxx; Taneja, Archit
> Subject: [PATCH 1/5] [media]: OMAP_VOUT: Fix check in reqbuf & mmap for
> buf_size allocation
>
> The commit 383e4f69879d11c86ebdd38b3356f6d0690fb4cc makes reqbuf and mmap
> prevent
> requesting a larger size buffer than what is allocated at kernel boot
> during
> omap_vout_probe.
>
> The requested size is compared with vout->buffer_size, this isn't correct
> as
> vout->buffer_size is later set to the size requested in reqbuf. When the
> video
> device is opened the next time, this check will prevent us to allocate a
> buffer
> which is larger than what we requested the last time.
>
> Don't use vout->buffer_size, always check with the parameters
> video1_bufsize
> or video2_bufsize.
>
> Signed-off-by: Archit Taneja <archit@xxxxxx>
> ---
> drivers/media/video/omap/omap_vout.c | 10 ++++++++--
> 1 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/video/omap/omap_vout.c
> b/drivers/media/video/omap/omap_vout.c
> index 95daf98..e14c82b 100644
> --- a/drivers/media/video/omap/omap_vout.c
> +++ b/drivers/media/video/omap/omap_vout.c
> @@ -664,10 +664,14 @@ static int omap_vout_buffer_setup(struct
> videobuf_queue *q, unsigned int *count,
> u32 phy_addr = 0, virt_addr = 0;
> struct omap_vout_device *vout = q->priv_data;
> struct omapvideo_info *ovid = &vout->vid_info;
> + int vid_max_buf_size;
>
> if (!vout)
> return -EINVAL;
>
> + vid_max_buf_size = vout->vid == OMAP_VIDEO1 ? video1_bufsize :
> + video2_bufsize;
> +
> if (V4L2_BUF_TYPE_VIDEO_OUTPUT != q->type)
> return -EINVAL;
>
> @@ -690,7 +694,7 @@ static int omap_vout_buffer_setup(struct
> videobuf_queue *q, unsigned int *count,
> video1_numbuffers : video2_numbuffers;
>
> /* Check the size of the buffer */
> - if (*size > vout->buffer_size) {
> + if (*size > vid_max_buf_size) {
Good catch !!!
> v4l2_err(&vout->vid_dev->v4l2_dev,
> "buffer allocation mismatch [%u] [%u]\n",
> *size, vout->buffer_size);
> @@ -865,6 +869,8 @@ static int omap_vout_mmap(struct file *file, struct
> vm_area_struct *vma)
> unsigned long size = (vma->vm_end - vma->vm_start);
> struct omap_vout_device *vout = file->private_data;
> struct videobuf_queue *q = &vout->vbq;
> + int vid_max_buf_size = vout->vid == OMAP_VIDEO1 ? video1_bufsize :
> + video2_bufsize;
>
> v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev,
> " %s pgoff=0x%lx, start=0x%lx, end=0x%lx\n", __func__,
> @@ -887,7 +893,7 @@ static int omap_vout_mmap(struct file *file, struct
> vm_area_struct *vma)
> return -EINVAL;
> }
> /* Check the size of the buffer */
> - if (size > vout->buffer_size) {
> + if (size > vid_max_buf_size) {
Don't you think in case of mmap we should still check for the
vout->buffer_size, since this is the size user has requested in req_buf.
Thanks,
Vaibhav
> v4l2_err(&vout->vid_dev->v4l2_dev,
> "insufficient memory [%lu] [%u]\n",
> size, vout->buffer_size);
> --
> 1.7.1
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