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

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Date: Fri, 15 Dec 2023 12:33:55 +0300
From: Fedor Pchelkin <pchelkin@...ras.ru>
To: Thierry Reding <thierry.reding@...il.com>
Cc: Fedor Pchelkin <pchelkin@...ras.ru>,
	Mikko Perttunen <mperttunen@...dia.com>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Arto Merilainen <amerilainen@...dia.com>,
	Terje Bergstrom <tbergstrom@...dia.com>,
	dri-devel@...ts.freedesktop.org,
	linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	lvc-project@...uxtesting.org
Subject: [PATCH] drm/tegra: put drm_gem_object ref on error in tegra_fb_create

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>
---
 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 a719af1dc9a5..46170753699d 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