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Subject: media: v4l: ioctl: Validate num_planes for debug messages Author: Sakari Ailus sakari.ailus@linux.intel.com Date: Thu Jan 10 09:24:26 2019 -0500

The num_planes field in struct v4l2_pix_format_mplane is used in a loop before validating it. As the use is printing a debug message in this case, just cap the value to the maximum allowed.

Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Cc: stable@vger.kernel.org Reviewed-by: Thierry Reding treding@nvidia.com Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Cc: stable@vger.kernel.org # for v4.12 and up Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org

drivers/media/v4l2-core/v4l2-ioctl.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

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diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c index 44bc7c4f1c11..90aad465f9ed 100644 --- a/drivers/media/v4l2-core/v4l2-ioctl.c +++ b/drivers/media/v4l2-core/v4l2-ioctl.c @@ -287,6 +287,7 @@ static void v4l_print_format(const void *arg, bool write_only) const struct v4l2_window *win; const struct v4l2_sdr_format *sdr; const struct v4l2_meta_format *meta; + u32 planes; unsigned i;

pr_cont("type=%s", prt_names(p->type, v4l2_type_names)); @@ -317,7 +318,8 @@ static void v4l_print_format(const void *arg, bool write_only) prt_names(mp->field, v4l2_field_names), mp->colorspace, mp->num_planes, mp->flags, mp->ycbcr_enc, mp->quantization, mp->xfer_func); - for (i = 0; i < mp->num_planes; i++) + planes = min_t(u32, mp->num_planes, VIDEO_MAX_PLANES); + for (i = 0; i < planes; i++) printk(KERN_DEBUG "plane %u: bytesperline=%u sizeimage=%u\n", i, mp->plane_fmt[i].bytesperline, mp->plane_fmt[i].sizeimage);