linux-kernel - [PATCH 1/5] media: dvb: fix compat ioctl tramslation

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Message-Id: <20180827195649.4170969-1-arnd@arndb.de>
Date:   Mon, 27 Aug 2018 21:56:21 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     linux-media@...r.kernel.org
Cc:     y2038@...ts.linaro.org, awalls@...metrocast.net,
        hans.verkuil@...co.com, mchehab@...nel.org,
        Arnd Bergmann <arnd@...db.de>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] media: dvb: fix compat ioctl tramslation

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@...db.de>
---
 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 a9b00942e87d..0c46ce224590 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -141,6 +141,7 @@ 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)
@@ -152,7 +153,7 @@ 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);
@@ -171,6 +172,7 @@ 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)
@@ -193,7 +195,7 @@ 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;
 }
@@ -1305,9 +1307,9 @@ 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);
 	}
 
-- 
2.18.0