linux-kernel - [PATCH v5.10 1/1] drm/amdgpu: add error handling for drm_fb_helper_initial

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>] [day] [month] [year] [list]

Message-Id: <20230312135053.7218-1-listdansp@mail.ru>
Date:   Sun, 12 Mar 2023 13:50:53 +0000
From:   Danila Chernetsov <listdansp@...l.ru>
To:     Alex Deucher <alexander.deucher@....com>
Cc:     Danila Chernetsov <listdansp@...l.ru>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: [PATCH v5.10 1/1] drm/amdgpu: add error handling for drm_fb_helper_initial_config

The type of return value of drm_fb_helper_initial_config is int, 
which may return wrong result, so we add error handling for it 
to reclaim memory resource, and return when an error occurs.          

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: d38ceaf99ed0 (drm/amdgpu: add core driver (v4))
Signed-off-by: Danila Chernetsov <listdansp@...l.ru>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
index 43f29ee0e3b0..e445a2c9f569 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
@@ -348,8 +348,17 @@ int amdgpu_fbdev_init(struct amdgpu_device *adev)
 	if (!amdgpu_device_has_dc_support(adev))
 		drm_helper_disable_unused_functions(adev_to_drm(adev));
 
-	drm_fb_helper_initial_config(&rfbdev->helper, bpp_sel);
-	return 0;
+	ret = drm_fb_helper_initial_config(&rfbdev->helper, bpp_sel);
+	if (ret)
+		goto fini;
+
+	return 0;
+
+fini:
+	drm_fb_helper_fini(&rfbdev->helper);
+
+	kfree(rfbdev);
+	return ret;
 }
 
 void amdgpu_fbdev_fini(struct amdgpu_device *adev)
-- 
2.25.1