linux-kernel - [PATCH AUTOSEL 5.15 29/47] drm/bridge: tc358767: Check if fully initialized before signalling HPD event via IRQ

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

Message-ID: <20240801003256.3937416-29-sashal@kernel.org>
Date: Wed, 31 Jul 2024 20:31:19 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Marek Vasut <marex@...x.de>,
	Robert Foss <rfoss@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	andrzej.hajda@...el.com,
	neil.armstrong@...aro.org,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	daniel@...ll.ch,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.15 29/47] drm/bridge: tc358767: Check if fully initialized before signalling HPD event via IRQ

From: Marek Vasut <marex@...x.de>

[ Upstream commit 162e48cb1d84c2c966b649b8ac5c9d4f75f6d44f ]

Make sure the connector is fully initialized before signalling any
HPD events via drm_kms_helper_hotplug_event(), otherwise this may
lead to NULL pointer dereference.

Signed-off-by: Marek Vasut <marex@...x.de>
Reviewed-by: Robert Foss <rfoss@...nel.org>
Signed-off-by: Robert Foss <rfoss@...nel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240531203333.277476-1-marex@denx.de
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/bridge/tc358767.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 4c6f3052156bd..3436d39c90b4c 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1527,7 +1527,7 @@ static irqreturn_t tc_irq_handler(int irq, void *arg)
 		dev_err(tc->dev, "syserr %x\n", stat);
 	}
 
-	if (tc->hpd_pin >= 0 && tc->bridge.dev) {
+	if (tc->hpd_pin >= 0 && tc->bridge.dev && tc->aux.drm_dev) {
 		/*
 		 * H is triggered when the GPIO goes high.
 		 *
-- 
2.43.0