linux-kernel - [PATCH 2/2] drm/fbdev: Ensure that one of the probe functions is defined

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

Message-Id: <20241002-vc4_fbdev_fix-v1-2-8737bd11b147@raspberrypi.com>
Date: Wed, 02 Oct 2024 16:06:20 +0100
From: Dave Stevenson <dave.stevenson@...pberrypi.com>
To: Maxime Ripard <mripard@...nel.org>, 
 Raspberry Pi Kernel Maintenance <kernel-list@...pberrypi.com>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
 Simona Vetter <simona@...ll.ch>, 
 Javier Martinez Canillas <javierm@...hat.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: [PATCH 2/2] drm/fbdev: Ensure that one of the probe functions is
 defined

Commit 5d08c44e47b9 ("drm/fbdev: Add memory-agnostic fbdev client")
added the newer probe function, but left a path where no probe
function was called. fb_helper->fb would then be NULL and the strcpy
would throw a NULL pointer exception.

Handle that error case.

Fixes: 5d08c44e47b9 ("drm/fbdev: Add memory-agnostic fbdev client")
Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
---
 drivers/gpu/drm/drm_fb_helper.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index d5e8994345bb..9c8868d7b9d3 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1635,6 +1635,8 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper)
 		ret = dev->driver->fbdev_probe(fb_helper, &sizes);
 	else if (fb_helper->funcs)
 		ret = fb_helper->funcs->fb_probe(fb_helper, &sizes);
+	else
+		ret = -EINVAL;
 	if (ret < 0)
 		return ret;
 

-- 
2.34.1