linux-kernel - [PATCH v2] drm/amdgpu: fix a possible null pointer dereference

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Message-Id: <20240711024531.1604757-1-make24@iscas.ac.cn>
Date: Thu, 11 Jul 2024 10:45:31 +0800
From: Ma Ke <make24@...as.ac.cn>
To: alexander.deucher@....com,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	daniel@...ll.ch,
	srinivasan.shanmugam@....com,
	make24@...as.ac.cn,
	guchun.chen@....com,
	chenjiahao16@...wei.com,
	Jammy.Zhou@....com
Cc: amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] drm/amdgpu: fix a possible null pointer dereference

In amdgpu_connector_add_common_modes(), the return value of drm_cvt_mode()
is assigned to mode, which will lead to a NULL pointer dereference on
failure of drm_cvt_mode(). Add a check to avoid npd.

Fixes: d38ceaf99ed0 ("drm/amdgpu: add core driver (v4)")
Signed-off-by: Ma Ke <make24@...as.ac.cn>
---
Changes in v2:
- modified the patch according to suggestions;
- added Fixes line.
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
index 9caba10315a8..21530f70a8bc 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
@@ -458,6 +458,8 @@ static void amdgpu_connector_add_common_modes(struct drm_encoder *encoder,
 			continue;
 
 		mode = drm_cvt_mode(dev, common_modes[i].w, common_modes[i].h, 60, false, false, false);
+		if (!mode)
+			return;
 		drm_mode_probed_add(connector, mode);
 	}
 }
-- 
2.25.1