V4L/DVB (13875): gspca - vc032x: Fix a possible crash with the vc0321 bridge.

The frame pointer returned by get_i_frame may be NULL when the application
is too slow.

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/media/video/gspca/vc032x.c b/drivers/media/video/gspca/vc032x.c
index c090efcd8045..71921c878424 100644
--- a/drivers/media/video/gspca/vc032x.c
+++ b/drivers/media/video/gspca/vc032x.c
@@ -3009,6 +3009,10 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
                 int l;
 
                 frame = gspca_get_i_frame(gspca_dev);
+                if (frame == NULL) {
+                        gspca_dev->last_packet_type = DISCARD_PACKET;
+                        return;
+                }
                 l = frame->data_end - frame->data;
                 if (len > frame->v4l2_buf.length - l)
                         len = frame->v4l2_buf.length - l;