[PATCH AUTOSEL 4.14 081/103] media: dvb: fix compat ioctl translation

Sasha Levin
2019-11-08T11:45:15Z

From: Arnd Bergmann <arnd@arndb.de>

[ Upstream commit 1ccbeeb888ac33627d91f1ccf0b84ef3bcadef24 ]

The VIDEO_GET_EVENT and VIDEO_STILLPICTURE was added back in 2005 but
it never worked because the command number is wrong.

Using the right command number means we have a better chance of them
actually doing the right thing, though clearly nobody has ever tried
it successfully.

I noticed these while auditing the remaining users of compat_time_t
for y2038 bugs. This one is fine in that regard, it just never did
anything.

Fixes: 6e87abd0b8cb ("[DVB]: Add compat ioctl handling.")

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/compat_ioctl.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index ea52b98b39fa1..033e8e6aabb77 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -161,6 +161,7 @@ struct compat_video_event {
unsigned int frame_rate;
} u;
};
+#define VIDEO_GET_EVENT32 _IOR('o', 28, struct compat_video_event)

static int do_video_get_event(struct file *file,
unsigned int cmd, struct compat_video_event __user *up)
@@ -172,7 +173,7 @@ static int do_video_get_event(struct file *file,
if (kevent == NULL)
return -EFAULT;

- err = do_ioctl(file, cmd, (unsigned long)kevent);
+ err = do_ioctl(file, VIDEO_GET_EVENT, (unsigned long)kevent);
if (!err) {
err = convert_in_user(&kevent->type, &up->type);
err |= convert_in_user(&kevent->timestamp, &up->timestamp);
@@ -191,6 +192,7 @@ struct compat_video_still_picture {
compat_uptr_t iFrame;
int32_t size;
};
+#define VIDEO_STILLPICTURE32 _IOW('o', 30, struct compat_video_still_picture)

static int do_video_stillpicture(struct file *file,
unsigned int cmd, struct compat_video_still_picture __user *up)
@@ -213,7 +215,7 @@ static int do_video_stillpicture(struct file *file,
if (err)
return -EFAULT;

- err = do_ioctl(file, cmd, (unsigned long) up_native);
+ err = do_ioctl(file, VIDEO_STILLPICTURE, (unsigned long) up_native);

return err;
}
@@ -1476,9 +1478,9 @@ static long do_ioctl_trans(unsigned int cmd,
return rtc_ioctl(file, cmd, argp);

/* dvb */
- case VIDEO_GET_EVENT:
+ case VIDEO_GET_EVENT32:
return do_video_get_event(file, cmd, argp);
- case VIDEO_STILLPICTURE:
+ case VIDEO_STILLPICTURE32:
return do_video_stillpicture(file, cmd, argp);
case VIDEO_SET_SPU_PALETTE:
return do_video_set_spu_palette(file, cmd, argp);
--
2.20.1