linux-kernel - [PATCH] drm/bridge: cdns-mhdp8546: unlock on error in cdns_mhdp_atomic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <aBHZBjiOVkI_8Shg@stanley.mountain>
Date: Wed, 30 Apr 2025 11:02:14 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Andrzej Hajda <andrzej.hajda@...el.com>
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
	Dmitry Baryshkov <lumag@...nel.org>,
	Douglas Anderson <dianders@...omium.org>,
	Lyude Paul <lyude@...hat.com>, Andy Yan <andy.yan@...k-chips.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Vitalii Mordan <mordan@...ras.ru>,
	Sui Jingfeng <sui.jingfeng@...ux.dev>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] drm/bridge: cdns-mhdp8546: unlock on error in
 cdns_mhdp_atomic_enable()

Unlock and reschedule if drm_mode_duplicate() fails.  In real life, the
drm_mode_duplicate() function does a small allocation and those never
fail in current kernels.  So this doesn't really affect runtime but
the missing unlock triggers a static checker warning.

Fixes: 935a92a1c400 ("drm: bridge: cdns-mhdp8546: Fix possible null pointer dereference")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index b431e7efd1f0..172039fbfab8 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -1984,8 +1984,10 @@ static void cdns_mhdp_atomic_enable(struct drm_bridge *bridge,
 	mhdp_state = to_cdns_mhdp_bridge_state(new_state);
 
 	mhdp_state->current_mode = drm_mode_duplicate(bridge->dev, mode);
-	if (!mhdp_state->current_mode)
-		return;
+	if (!mhdp_state->current_mode) {
+		ret = -ENOMEM;
+		goto out;
+	}
 
 	drm_mode_set_name(mhdp_state->current_mode);
 
-- 
2.47.2