4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Matthew Auld <matthew.a...@intel.com>
commit c11c7bfd213495784b22ef82a69b6489f8d0092f upstream.
Operating on a zero sized GEM userptr object will lead to explosions.
Fixes: 5cc9ed4b9a7a ("drm/i915: Introduce mapping of user pages into video
memory (userptr) ioctl")
Testcase: igt/gem_userptr_blits/input-checking
Signed-off-by: Matthew Auld <matthew.a...@intel.com>
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <ch...@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Link:
https://patchwork.freedesktop.org/patch/msgid/20180502195021.30900-1-matthew.a...@intel.com
Cc: Loic <hack...@opensec.fr>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/gpu/drm/i915/i915_gem_userptr.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/i915/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
@@ -842,6 +842,9 @@ i915_gem_userptr_ioctl(struct drm_device
I915_USERPTR_UNSYNCHRONIZED))
return -EINVAL;
+ if (!args->user_size)
+ return -EINVAL;
+
if (offset_in_page(args->user_ptr | args->user_size))
return -EINVAL;
