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drm: use drms ioctl cmd not what we get passed from userspace.

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This enforces us to use the drm ioctl types so read/write works correctly and not believe
what userspace tells us.

It does this hopefully without breaking the drm api.

Fixes bug from thread: BUG: unable to handle kernel NULL pointer dereference (drm_getunique)

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Johannes Weiner 2008-06-13 15:04:40 +10:00 committed by Dave Airlie
parent 5dd34572ad
commit 41ee2ff404
1 changed files with 2 additions and 0 deletions
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2
drivers/char/drm/drm_drv.c
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@ -475,6 +475,8 @@ int drm_ioctl(struct inode *inode, struct file *filp,
else
goto err_i1;
/* Do not trust userspace, use our own definition */
cmd = ioctl->cmd;
func = ioctl->func;
/* is there a local override? */
if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)