linux-kernel - [PATCH 6.8 458/715] drm/tegra: put drm_gem_object ref on error in tegra_fb

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Date: Sun, 24 Mar 2024 18:30:37 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Fedor Pchelkin <pchelkin@...ras.ru>,
	Thierry Reding <treding@...dia.com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.8 458/715] drm/tegra: put drm_gem_object ref on error in tegra_fb_create

From: Fedor Pchelkin <pchelkin@...ras.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@...ras.ru>
Signed-off-by: Thierry Reding <treding@...dia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231215093356.12067-1-pchelkin@ispras.ru
Signed-off-by: Sasha Levin <sashal@...nel.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 a719af1dc9a57..46170753699dc 100644
--- a/drivers/gpu/drm/tegra/fb.c
+++ b/drivers/gpu/drm/tegra/fb.c
@@ -159,6 +159,7 @@ struct drm_framebuffer *tegra_fb_create(struct drm_device *drm,
 
 		if (gem->size < size) {
 			err = -EINVAL;
+			drm_gem_object_put(gem);
 			goto unreference;
 		}
 
-- 
2.43.0