linux-kernel - [PATCH 2/2] drm/amd/display: Fix null pointer dereference in error message

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Date:   Tue, 26 Sep 2023 13:56:17 +0800
From:   Cong Liu <liucong2@...inos.cn>
To:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Aurabindo Pillai <aurabindo.pillai@....com>,
        Tom Chung <chiahsuan.chung@....com>
Cc:     Cong Liu <liucong2@...inos.cn>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] drm/amd/display: Fix null pointer dereference in error message

This patch fixes a null pointer dereference in the error message that is
printed when the Display Core (DC) fails to initialize. The original
message includes the DC version number, which is undefined if the DC is
not initialized.

Fixes: 9788d087caff ("drm/amd/display: improve the message printed when loading DC")
Signed-off-by: Cong Liu <liucong2@...inos.cn>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 8e98dda1e084..bf52a909f558 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1703,8 +1703,7 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 		DRM_INFO("Display Core v%s initialized on %s\n", DC_VER,
 			 dce_version_to_string(adev->dm.dc->ctx->dce_version));
 	} else {
-		DRM_INFO("Display Core v%s failed to initialize on %s\n", DC_VER,
-			 dce_version_to_string(adev->dm.dc->ctx->dce_version));
+		DRM_INFO("Display Core failed to initialize with v%s!\n", DC_VER);
 		goto error;
 	}
 
-- 
2.34.1