linux-kernel - [PATCH] fbdev/xen-fbfront: Assign fb

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Message-ID: <20240910020919.5757-1-jandryuk@gmail.com>
Date: Mon,  9 Sep 2024 22:09:16 -0400
From: Jason Andryuk <jandryuk@...il.com>
To: Helge Deller <deller@....de>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Arnd Bergmann <arnd@...db.de>,
	Sam Ravnborg <sam@...nborg.org>
Cc: xen-devel@...ts.xenproject.org,
	Jason Andryuk <jason.andryuk@....com>,
	Arthur Borsboom <arthurborsboom@...il.com>,
	stable@...r.kernel.org,
	linux-fbdev@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] fbdev/xen-fbfront: Assign fb_info->device

From: Jason Andryuk <jason.andryuk@....com>

Probing xen-fbfront faults in video_is_primary_device().  The passed-in
struct device is NULL since xen-fbfront doesn't assign it and the
memory is kzalloc()-ed.  Assign fb_info->device to avoid this.

This was exposed by the conversion of fb_is_primary_device() to
video_is_primary_device() which dropped a NULL check for struct device.

Fixes: f178e96de7f0 ("arch: Remove struct fb_info from video helpers")
Reported-by: Arthur Borsboom <arthurborsboom@...il.com>
Closes: https://lore.kernel.org/xen-devel/CALUcmUncX=LkXWeiSiTKsDY-cOe8QksWhFvcCneOKfrKd0ZajA@mail.gmail.com/
Tested-by: Arthur Borsboom <arthurborsboom@...il.com>
CC: stable@...r.kernel.org
Signed-off-by: Jason Andryuk <jason.andryuk@....com>
---
The other option would be to re-instate the NULL check in
video_is_primary_device()
---
 drivers/video/fbdev/xen-fbfront.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/video/fbdev/xen-fbfront.c b/drivers/video/fbdev/xen-fbfront.c
index 66d4628a96ae..c90f48ebb15e 100644
--- a/drivers/video/fbdev/xen-fbfront.c
+++ b/drivers/video/fbdev/xen-fbfront.c
@@ -407,6 +407,7 @@ static int xenfb_probe(struct xenbus_device *dev,
 	/* complete the abuse: */
 	fb_info->pseudo_palette = fb_info->par;
 	fb_info->par = info;
+	fb_info->device = &dev->dev;
 
 	fb_info->screen_buffer = info->fb;
 
-- 
2.43.0