linux-kernel - [PATCH v2] drm/rockchip: analogix_dp: Add missing error check for platform_get

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Message-Id: <20260209033123.1089370-1-nichen@iscas.ac.cn>
Date: Mon,  9 Feb 2026 11:31:23 +0800
From: Chen Ni <nichen@...as.ac.cn>
To: dsimic@...jaro.org
Cc: airlied@...il.com,
	andy.yan@...k-chips.com,
	damon.ding@...k-chips.com,
	dri-devel@...ts.freedesktop.org,
	heiko@...ech.de,
	hjc@...k-chips.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	simona@...ll.ch,
	tzimmermann@...e.de,
	Chen Ni <nichen@...as.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH v2] drm/rockchip: analogix_dp: Add missing error check for platform_get_resource()

Add missing error check for platform_get_resource() return value to
prevent NULL pointer dereference when memory resource is not available.

Fixes: 718b3bb9c0ab ("drm/rockchip: analogix_dp: Expand device data to support multiple edp display")
Cc: stable@...r.kernel.org
Signed-off-by: Chen Ni <nichen@...as.ac.cn>
Reviewed-by: Dragan Simic <dsimic@...jaro.org>
---
Changes in v2:
- Add Reviewed-by tag from Dragan Simic
- Add Cc stable tag as suggested
---
 drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
index fdab71d51e2a..3f5be14010c1 100644
--- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
+++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
@@ -461,6 +461,8 @@ static int rockchip_dp_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EINVAL;
 
 	i = 0;
 	while (dp_data[i].reg) {
-- 
2.25.1