From: Fedor Pchelkin pchelkin@ispras.ru
[ Upstream commit 32e5a120a5105bce01561978ee55aee8e40ac0dc ]
Inside tegra_fb_create(), drm_gem_object_lookup() increments ref count of the found object. But if the following size check fails then the last found object's ref count should be put there as the unreferencing loop can't detect this situation.
Found by Linux Verification Center (linuxtesting.org).
Fixes: de2ba664c30f ("gpu: host1x: drm: Add memory manager and fb") Signed-off-by: Fedor Pchelkin pchelkin@ispras.ru Signed-off-by: Thierry Reding treding@nvidia.com Link: https://patchwork.freedesktop.org/patch/msgid/20231215093356.12067-1-pchelki... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/tegra/fb.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/tegra/fb.c b/drivers/gpu/drm/tegra/fb.c index 01939c57fc74d..2040dbfed7e21 100644 --- a/drivers/gpu/drm/tegra/fb.c +++ b/drivers/gpu/drm/tegra/fb.c @@ -155,6 +155,7 @@ struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
if (gem->size < size) { err = -EINVAL; + drm_gem_object_put(gem); goto unreference; }