Input: uinput - handle compat ioctl for UI_SET_PHYS

When running a 32-bit userspace on a 64-bit kernel, the UI_SET_PHYS
ioctl needs to be treated with special care, as it has the pointer
size encoded in the command.

Signed-off-by: Ricky Liang <jcliang@chromium.org>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
index 4eb9e4d94f46..79338f4bdecb 100644
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -981,9 +981,15 @@ static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 }
 
 #ifdef CONFIG_COMPAT
+
+#define UI_SET_PHYS_COMPAT      _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
+
 static long uinput_compat_ioctl(struct file *file,
                                 unsigned int cmd, unsigned long arg)
 {
+        if (cmd == UI_SET_PHYS_COMPAT)
+                cmd = UI_SET_PHYS;
+
         return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
 }
 #endif