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| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2023-04-12 18:31:46 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-04-20 13:35:07 +0300 |
| commit | b15df140fe092c3ac28dab32c6b3acdda1a93c63 (patch) | |
| tree | 6e37047e02ad3f3a2156bb6ffbeff36cc5b21bea /drivers/video | |
| parent | 93aa242f598ee93dee1e6b0d23aac1cb312c0f2e (diff) | |
| download | linux-b15df140fe092c3ac28dab32c6b3acdda1a93c63.tar.xz | |
fbcon: set_con2fb_map needs to set con2fb_map!
commit fffb0b52d5258554c645c966c6cbef7de50b851d upstream.
I got really badly confused in d443d9386472 ("fbcon: move more common
code into fb_open()") because we set the con2fb_map before the failure
points, which didn't look good.
But in trying to fix that I moved the assignment into the wrong path -
we need to do it for _all_ vc we take over, not just the first one
(which additionally requires the call to con2fb_acquire_newinfo).
I've figured this out because of a KASAN bug report, where the
fbcon_registered_fb and fbcon_display arrays went out of sync in
fbcon_mode_deleted() because the con2fb_map pointed at the old
fb_info, but the modes and everything was updated for the new one.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Acked-by: Helge Deller <deller@gmx.de>
Tested-by: Xingyuan Mo <hdthky0@gmail.com>
Fixes: d443d9386472 ("fbcon: move more common code into fb_open()")
Reported-by: Xingyuan Mo <hdthky0@gmail.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Xingyuan Mo <hdthky0@gmail.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Helge Deller <deller@gmx.de>
Cc: <stable@vger.kernel.org> # v5.19+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/fbdev/core/fbcon.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c index b9dc29d688d6..fa205be94a4b 100644 --- a/drivers/video/fbdev/core/fbcon.c +++ b/drivers/video/fbdev/core/fbcon.c @@ -846,10 +846,11 @@ static int set_con2fb_map(int unit, int newidx, int user) if (err) return err; - con2fb_map[unit] = newidx; fbcon_add_cursor_work(info); } + con2fb_map[unit] = newidx; + /* * If old fb is not mapped to any of the consoles, * fbcon should release it. |