linux/drivers/video
Javier Martinez Canillas aafa025c76
fbdev: Make fb_release() return -ENODEV if fbdev was unregistered
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 registered framebuffer device is for a
driver that just uses a framebuffer provided by the system firmware. In
that case, the fbdev core would unregister the framebuffer device when a
real video driver is probed and ask to remove conflicting framebuffers.

The bug has been present for a long time but commit 27599aacba ("fbdev:
Hot-unplug firmware fb devices on forced removal") unmasked it since the
fbdev core started unregistering the framebuffers' devices associated.

Fixes: 27599aacba ("fbdev: Hot-unplug firmware fb devices on forced removal")
Reported-by: Maxime Ripard <maxime@cerno.tech>
Reported-by: Junxiao Chang <junxiao.chang@intel.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220502135014.377945-1-javierm@redhat.com
2022-05-03 17:24:51 +02:00
..
backlight - New Device Support 2022-03-25 14:01:23 -07:00
console nds32: Remove the architecture 2022-03-07 13:54:59 +01:00
fbdev fbdev: Make fb_release() return -ENODEV if fbdev was unregistered 2022-05-03 17:24:51 +02:00
logo
display_timing.c
hdmi.c video: fix some kernel-doc markups 2020-11-16 18:23:16 +01:00
Kconfig
Makefile
of_display_timing.c video: Fix kernel-doc warnings in of_display_timing + of_videomode 2020-11-29 22:42:17 +01:00
of_videomode.c video: Fix kernel-doc warnings in of_display_timing + of_videomode 2020-11-29 22:42:17 +01:00
vgastate.c
videomode.c