drm/i915: Defend against userspace creating a gem object with size==0

We currently only round up the userspace size to the next page. We
assume that userspace hasn't made a mistake and requested a zero-length
gem object and all through our internal code we then presume that every
object is backed by at least a single page. Fix that oversight and
report EINVAL back to userspace if they try to create a zero length
object.

[danvet: This fixes tests/gem_bad_length]

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index d8e0c15..52b199d 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -195,6 +195,8 @@ i915_gem_create(struct drm_file *file,
        u32 handle;
 
        size = roundup(size, PAGE_SIZE);
+       if (size == 0)
+               return -EINVAL;
 
        /* Allocate the new object */
        obj = i915_gem_alloc_object(dev, size);