The call to v4l2_std_construct() in the VIDIOC_G_PARM handler treats
vfd->current_norm as if it were an index - but it's not. The result is
an oops if the driver has no vidioc_g_parm() method defined. Here's the
fix.
jon
Signed-off-by: Jonathan Corbet <[email protected]>
--- /k/t/2.6.19-rc1/drivers/media/video/videodev.c 2006-10-05 16:05:24.000000000 -0600
+++ 19-jc/drivers/media/video/videodev.c 2006-10-12 11:11:07.000000000 -0600
@@ -1287,6 +1288,7 @@ static int __video_do_ioctl(struct inode
ret=vfd->vidioc_g_parm(file, fh, p);
} else {
struct v4l2_standard s;
+ int i;
if (!vfd->tvnormsize) {
printk (KERN_WARNING "%s: no TV norms defined!\n",
@@ -1297,8 +1299,14 @@ static int __video_do_ioctl(struct inode
if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
return -EINVAL;
- v4l2_video_std_construct(&s, vfd->tvnorms[vfd->current_norm].id,
- vfd->tvnorms[vfd->current_norm].name);
+ for (i = 0; i < vfd->tvnormsize; i++)
+ if (vfd->tvnorms[i].id == vfd->current_norm)
+ break;
+ if (i >= vfd->tvnormsize)
+ return -EINVAL;
+
+ v4l2_video_std_construct(&s, vfd->current_norm,
+ vfd->tvnorms[i].name);
memset(p,0,sizeof(*p));
-
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