Tetsuo Handa 73d58890be fbcon: Fix user font detection test at fbcon_resize(). ... [ Upstream commit ec0972adec ] syzbot is reporting OOB read at fbcon_resize() [1], for commit 39b3cffb8c ("fbcon: prevent user font height or width change from causing potential out-of-bounds access") is by error using registered_fb[con2fb_map[vc->vc_num]]->fbcon_par->p->userfont (which was set to non-zero) instead of fb_display[vc->vc_num].userfont (which remains zero for that display). We could remove tricky userfont flag [2], for we can determine it by comparing address of the font data and addresses of built-in font data. But since that commit is failing to fix the original OOB read [3], this patch keeps the change minimal in case we decide to revert altogether. [1] https://syzkaller.appspot.com/bug?id=ebcbbb6576958a496500fee9cf7aa83ea00b5920 [2] https://syzkaller.appspot.com/text?tag=Patch&x=14030853900000 [3] https://syzkaller.appspot.com/bug?id=6fba8c186d97cf1011ab17660e633b1cc4e080c9 Reported-by: syzbot <syzbot+b38b1ef6edf0c74a8d97@syzkaller.appspotmail.com> Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Fixes: 39b3cffb8c ("fbcon: prevent user font height or width change from causing potential out-of-bounds access") Cc: George Kennedy <george.kennedy@oracle.com> Link: https://lore.kernel.org/r/f6e3e611-8704-1263-d163-f52c906a4f06@I-love.SAKURA.ne.jp Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-09-23 12:40:41 +02:00
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backlight	backlight: lp855x: Ensure regulators are disabled on probe failure	2020-06-24 17:50:09 +02:00
console	vgacon: remove software scrollback support	2020-09-17 13:47:54 +02:00
fbdev	fbcon: Fix user font detection test at fbcon_resize().	2020-09-23 12:40:41 +02:00
logo	video/logo: do not generate unneeded logo C files	2019-10-05 15:29:49 +09:00
Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
display_timing.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428	2019-06-05 17:37:16 +02:00
hdmi.c	video/hdmi: Fix AVI bar unpack	2019-12-17 19:56:42 +01:00
of_display_timing.c	video: of: display_timing: Don't yell if no timing node is present	2019-07-26 16:32:26 +02:00
of_videomode.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428	2019-06-05 17:37:16 +02:00
vgastate.c	Video: vgastate: fixed a spacing coding style	2018-10-08 12:57:35 +02:00
videomode.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428	2019-06-05 17:37:16 +02:00