V4L/DVB (10920): v4l2-ioctl: fix partial-copy code.
The code to optimize the usercopy only checked the ioctl NR field. However,
this code is also called for non-V4L2 ioctls (either private or ioctls from
linux/dvb/audio.h and linux/dvb/video.h for decoder drivers like ivtv).
If such an ioctl has the same NR as a V4L2 ioctl, then disaster strikes.
Modified the code to check on the full command ID.
Thanks to Martin Dauskardt for tracing the ivtv breakage to this particular
change.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/v4l2-ioctl.c b/drivers/media/video/v4l2-ioctl.c
index df8d1ff..54ba6b0 100644
--- a/drivers/media/video/v4l2-ioctl.c
+++ b/drivers/media/video/v4l2-ioctl.c
@@ -1796,11 +1796,12 @@
static unsigned long cmd_input_size(unsigned int cmd)
{
/* Size of structure up to and including 'field' */
-#define CMDINSIZE(cmd, type, field) case _IOC_NR(VIDIOC_##cmd): return \
- offsetof(struct v4l2_##type, field) + \
- sizeof(((struct v4l2_##type *)0)->field);
+#define CMDINSIZE(cmd, type, field) \
+ case VIDIOC_##cmd: \
+ return offsetof(struct v4l2_##type, field) + \
+ sizeof(((struct v4l2_##type *)0)->field);
- switch (_IOC_NR(cmd)) {
+ switch (cmd) {
CMDINSIZE(ENUM_FMT, fmtdesc, type);
CMDINSIZE(G_FMT, format, type);
CMDINSIZE(QUERYBUF, buffer, type);