From b553fd36b4bb82d6855dbcb2f4fd96fb52625b99 Mon Sep 17 00:00:00 2001
From: Fedor Pchelkin <pchelkin@ispras.ru>
Date: Fri, 15 Dec 2023 12:33:55 +0300
Subject: [PATCH] drm/tegra: put drm_gem_object ref on error in tegra_fb_create
[ 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-pchelkin@ispras.ru
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;
}
--
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