From 0dd99f1bfc8a3661f095c00f9f86f5bafbd4fdff Mon Sep 17 00:00:00 2001 From: Andy Lutomirski Date: Mon, 13 May 2013 23:58:48 +0000 Subject: drm: Don't leak phys_wc "handles" to userspace I didn't fix this in the earlier patch -- it would have broken the build due to the now-deleted garbage in drm_os_linux.h. Reviewed-by: Daniel Vetter Signed-off-by: Andy Lutomirski Signed-off-by: Dave Airlie --- drivers/gpu/drm/drm_bufs.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/gpu/drm/drm_bufs.c') diff --git a/drivers/gpu/drm/drm_bufs.c b/drivers/gpu/drm/drm_bufs.c index 0190fce20078..5a4dbb410b71 100644 --- a/drivers/gpu/drm/drm_bufs.c +++ b/drivers/gpu/drm/drm_bufs.c @@ -414,6 +414,15 @@ int drm_addmap_ioctl(struct drm_device *dev, void *data, /* avoid a warning on 64-bit, this casting isn't very nice, but the API is set so too late */ map->handle = (void *)(unsigned long)maplist->user_token; + + /* + * It appears that there are no users of this value whatsoever -- + * drmAddMap just discards it. Let's not encourage its use. + * (Keeping drm_addmap_core's returned mtrr value would be wrong -- + * it's not a real mtrr index anymore.) + */ + map->mtrr = -1; + return 0; } -- cgit v1.2.3