media: stm32-dcmi: fix crash when subdev do not expose any formats

Do not access sd_formats[] if num_of_sd_formats is zero, ie
subdev sensor didn't expose any formats.

Signed-off-by: Hugues Fruchet <hugues.fruchet@st.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c
index b63d57cd89e5..906e71b19039 100644
--- a/drivers/media/platform/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/stm32/stm32-dcmi.c
@@ -831,6 +831,9 @@ static int dcmi_try_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f,
 
         sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
         if (!sd_fmt) {
+                if (!dcmi->num_of_sd_formats)
+                        return -ENODATA;
+
                 sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
                 pix->pixelformat = sd_fmt->fourcc;
         }
@@ -1009,6 +1012,9 @@ static int dcmi_set_sensor_format(struct stm32_dcmi *dcmi,
 
         sd_fmt = find_format_by_fourcc(dcmi, pix->pixelformat);
         if (!sd_fmt) {
+                if (!dcmi->num_of_sd_formats)
+                        return -ENODATA;
+
                 sd_fmt = dcmi->sd_formats[dcmi->num_of_sd_formats - 1];
                 pix->pixelformat = sd_fmt->fourcc;
         }