[media] av7110: potential divide by zero

"len" comes from dvb_video_ioctl() and there is a possibility that it is
zero.  We do a divide by len later in the function so that's not ok.

Signed-off-by: Dan Carpenter <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

diff --git a/drivers/media/pci/ttpci/av7110_av.c b/drivers/media/pci/ttpci/av7110_av.c
index ccb3b2c89ef8385e0932e12e20fa02bf6f2981f2..1cf906047353c87534dae78831e471a8f34060c2 100644 (file)
--- a/drivers/media/pci/ttpci/av7110_av.c
+++ b/drivers/media/pci/ttpci/av7110_av.c
@@ -1045,6 +1045,9 @@ static int play_iframe(struct av7110 *av7110, char __user *buf, unsigned int len
 
        dprintk(2, "av7110:%p, \n", av7110);
 
+       if (len == 0)
+               return 0;
+
        if (!(av7110->playing & RP_VIDEO)) {
                if (av7110_av_start_play(av7110, RP_VIDEO) < 0)
                        return -EBUSY;