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drm/i915/userptr: reject zero user_size
authorMatthew Auld <matthew.auld@intel.com>
Wed, 2 May 2018 19:50:21 +0000 (20:50 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 9 Sep 2018 17:55:53 +0000 (19:55 +0200)
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.auld@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20180502195021.30900-1-matthew.auld@intel.com
Cc: Loic <hackurx@opensec.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/gpu/drm/i915/i915_gem_userptr.c patch | blob | blame | history

diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c
index 709efe2357eac9948ba71a76e11c02ace9f6ae4c..05ae8c4a8a1b615e272d4bb20d09b748f6b1e885 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/i915_gem_userptr.c
@@ -782,6 +782,9 @@ i915_gem_userptr_ioctl(struct drm_device *dev, void *data, struct drm_file *file
                            I915_USERPTR_UNSYNCHRONIZED))
                return -EINVAL;
 
+       if (!args->user_size)
+               return -EINVAL;
+
        if (offset_in_page(args->user_ptr | args->user_size))
                return -EINVAL;