From dc6057ecb39edb34b0461ca55382094410bd257a Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Thu, 30 Oct 2014 15:32:56 +0100 Subject: [PATCH] drm/tegra: gem: dumb: pitch and size are outputs When creating a dumb buffer object using the DRM_IOCTL_MODE_CREATE_DUMB IOCTL, only the width, height, bpp and flags parameters are inputs. The caller is not guaranteed to zero out or set handle, pitch and size, so the driver must not treat these values as possible inputs. Fixes a bug where running the Weston compositor on Tegra DRM would cause an attempt to allocate a 3 GiB framebuffer to be allocated. Fixes: de2ba664c30f ("gpu: host1x: drm: Add memory manager and fb") Cc: stable@vger.kernel.org Signed-off-by: Thierry Reding --- drivers/gpu/drm/tegra/gem.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c index 8b1095d05c58..8348783f7d64 100644 --- a/drivers/gpu/drm/tegra/gem.c +++ b/drivers/gpu/drm/tegra/gem.c @@ -399,16 +399,12 @@ void tegra_bo_free_object(struct drm_gem_object *gem) int tegra_bo_dumb_create(struct drm_file *file, struct drm_device *drm, struct drm_mode_create_dumb *args) { - int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); + unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8); struct tegra_drm *tegra = drm->dev_private; struct tegra_bo *bo; - min_pitch = round_up(min_pitch, tegra->pitch_align); - if (args->pitch < min_pitch) - args->pitch = min_pitch; - - if (args->size < args->pitch * args->height) - args->size = args->pitch * args->height; + args->pitch = round_up(min_pitch, tegra->pitch_align); + args->size = args->pitch * args->height; bo = tegra_bo_create_with_handle(file, drm, args->size, 0, &args->handle); -- 2.20.1