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Re: [PATCH] fbdev/xen-fbfront: Assign fb_info->device
- To: Jason Andryuk <jandryuk@xxxxxxxxx>, Helge Deller <deller@xxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Sam Ravnborg <sam@xxxxxxxxxxxx>
- From: Thomas Zimmermann <tzimmermann@xxxxxxx>
- Date: Tue, 10 Sep 2024 09:26:42 +0200
- Authentication-results: smtp-out1.suse.de; none
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Jason Andryuk <jason.andryuk@xxxxxxx>, Arthur Borsboom <arthurborsboom@xxxxxxxxx>, stable@xxxxxxxxxxxxxxx, linux-fbdev@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- Delivery-date: Tue, 10 Sep 2024 07:27:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Am 10.09.24 um 04:09 schrieb Jason Andryuk:
From: Jason Andryuk <jason.andryuk@xxxxxxx>
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@xxxxxxxxx>
Closes:
https://lore.kernel.org/xen-devel/CALUcmUncX=LkXWeiSiTKsDY-cOe8QksWhFvcCneOKfrKd0ZajA@xxxxxxxxxxxxxx/
Tested-by: Arthur Borsboom <arthurborsboom@xxxxxxxxx>
CC: stable@xxxxxxxxxxxxxxx
Signed-off-by: Jason Andryuk <jason.andryuk@xxxxxxx>
Reviewed-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Thanks a lot.
---
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;
--
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)
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