linux-kernel - [PATCH AUTOSEL 4.19 07/23] drm/framebuffer: Fix use of uninitialized variable

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Date: Mon, 22 Jan 2024 10:17:47 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Maxime Ripard <mripard@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	maarten.lankhorst@...ux.intel.com,
	tzimmermann@...e.de,
	airlied@...il.com,
	daniel@...ll.ch,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 4.19 07/23] drm/framebuffer: Fix use of uninitialized variable

From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

[ Upstream commit f9af8f0c1dc567a5a6a6318ff324c45d80d4a60f ]

smatch reports:

drivers/gpu/drm/drm_framebuffer.c:654 drm_mode_getfb2_ioctl() error: uninitialized symbol 'ret'.

'ret' is possibly not set when there are no errors, causing the error
above. I can't say if that ever happens in real-life, but in any case I
think it is good to initialize 'ret' to 0.

Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Acked-by: Maxime Ripard <mripard@...nel.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231103-uninit-fixes-v2-2-c22b2444f5f5@ideasonboard.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/drm_framebuffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
index b64a6ffc0aed..9fc4af4b10a6 100644
--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -538,7 +538,7 @@ int drm_mode_dirtyfb_ioctl(struct drm_device *dev,
 	struct drm_framebuffer *fb;
 	unsigned flags;
 	int num_clips;
-	int ret;
+	int ret = 0;
 
 	if (!drm_core_check_feature(dev, DRIVER_MODESET))
 		return -EINVAL;
-- 
2.43.0