linux-kernel - [PATCH] drm/bridge: anx7625: Check GPIO description to avoid crash

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-next>] [day] [month] [year] [list]

Message-Id: <20211118031125.3778969-1-xji@analogixsemi.com>
Date:   Thu, 18 Nov 2021 11:11:25 +0800
From:   Xin Ji <xji@...logixsemi.com>
To:     a.hajda@...sung.com, narmstrong@...libre.com,
        dan.carpenter@...cle.com, robert.foss@...aro.org,
        Laurent.pinchart@...asonboard.com, jonas@...boo.se,
        jernej.skrabec@...il.com, airlied@...ux.ie, daniel@...ll.ch,
        sam@...nborg.org, pihsun@...omium.org, tzungbi@...gle.com,
        maxime@...no.tech, drinkcat@...gle.com, hsinyi@...omium.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        bliang@...logixsemi.com, qwen@...logixsemi.com
Cc:     Xin Ji <xji@...logixsemi.com>
Subject: [PATCH] drm/bridge: anx7625: Check GPIO description to avoid crash

As GPIO probe function "devm_gpiod_get_optional()" may return error
code, driver should identify GPIO desc as NULL to avoid crash.

Signed-off-by: Xin Ji <xji@...logixsemi.com>
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 001fb39d9919..36e0ae5a1c7b 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -1098,9 +1098,18 @@ static void anx7625_init_gpio(struct anx7625_data *platform)
 	/* Gpio for chip power enable */
 	platform->pdata.gpio_p_on =
 		devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
+	if (IS_ERR(platform->pdata.gpio_p_on)) {
+		DRM_DEV_DEBUG_DRIVER(dev, "no enable gpio found\n");
+		platform->pdata.gpio_p_on = NULL;
+	}
+
 	/* Gpio for chip reset */
 	platform->pdata.gpio_reset =
 		devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(platform->pdata.gpio_reset)) {
+		DRM_DEV_DEBUG_DRIVER(dev, "no reset gpio found\n");
+		platform->pdata.gpio_p_on = NULL;
+	}
 
 	if (platform->pdata.gpio_p_on && platform->pdata.gpio_reset) {
 		platform->pdata.low_power_mode = 1;
-- 
2.25.1