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drm: Don't leak phys_wc "handles" to userspace

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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 <daniel.vetter@ffwll.ch>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Andy Lutomirski 2013-05-13 23:58:48 +00:00 committed by Dave Airlie
parent 03dae7c567
commit 0dd99f1bfc
2 changed files with 23 additions and 1 deletions
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9
drivers/gpu/drm/drm_bufs.c
View file

@ -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;
}

15
drivers/gpu/drm/drm_ioctl.c
View file

@ -38,6 +38,9 @@
#include <linux/pci.h>
#include <linux/export.h>
#ifdef CONFIG_X86
#include <asm/mtrr.h>
#endif
/**
* Get the bus id.
@ -181,7 +184,17 @@ int drm_getmap(struct drm_device *dev, void *data,
map->type = r_list->map->type;
map->flags = r_list->map->flags;
map->handle = (void *)(unsigned long) r_list->user_token;
map->mtrr = r_list->map->mtrr;
#ifdef CONFIG_X86
/*
* There appears to be exactly one user of the mtrr index: dritest.
* It's easy enough to keep it working on non-PAT systems.
*/
map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
#else
map->mtrr = -1;
#endif
mutex_unlock(&dev->struct_mutex);
return 0;