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next: drm/atomic: Use copy_from_user to copy 64 bit data from user space

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Copying 64 bit data from user space using get_user is not supported
on all architectures, and may result in the following build error.

ERROR: "__get_user_bad" [drivers/gpu/drm/drm.ko] undefined!

Avoid the problem by using copy_from_user.

Fixes: d34f20d6e2 ("drm: Atomic modeset ioctl")
Cc: Rob Clark <robdclark@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Guenter Roeck 2015-01-12 21:12:17 -08:00 committed by Daniel Vetter
parent cdd1cf799b
commit 42c5814c9c
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/drm_atomic.c
View file

@ -1259,7 +1259,9 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
goto fail;
}
if (get_user(prop_value, prop_values_ptr + copied_props)) {
if (copy_from_user(&prop_value,
prop_values_ptr + copied_props,
sizeof(prop_value))) {
ret = -EFAULT;
goto fail;
}