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Subject[PATCH 2/2] fbdev: Make fb_release() return -ENODEV if fbdev was unregistered
Date
A reference to the framebuffer device struct fb_info is stored in the file
private data, but this reference could no longer be valid and must not be
accessed directly. Instead, the file_fb_info() accessor function must be
used since it does sanity checking to make sure that the fb_info is valid.

This can happen for example if the fbdev driver was one that is using a
framebuffer provided by the system firmware. In that case, the fbdev core
could unregister the framebuffer device if a real video driver is probed.

Reported-by: Maxime Ripard <maxime@cerno.tech>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---

drivers/video/fbdev/core/fbmem.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 20d8929df79f..d68097105f93 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1439,7 +1439,10 @@ fb_release(struct inode *inode, struct file *file)
__acquires(&info->lock)
__releases(&info->lock)
{
- struct fb_info * const info = file->private_data;
+ struct fb_info * const info = file_fb_info(file);
+
+ if (!info)
+ return -ENODEV;

lock_fb_info(info);
if (info->fbops->fb_release)
--
2.35.1
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