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TencentOS-kernel/drivers/video/fbdev/core
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George Kennedy 8e14c3a656 fbmem: add margin check to fb_check_caps() 
[ Upstream commit a49145acfb975d921464b84fe00279f99827d816 ]

A fb_ioctl() FBIOPUT_VSCREENINFO call with invalid xres setting
or yres setting in struct fb_var_screeninfo will result in a
KASAN: vmalloc-out-of-bounds failure in bitfill_aligned() as
the margins are being cleared. The margins are cleared in
chunks and if the xres setting or yres setting is a value of
zero upto the chunk size, the failure will occur.

Add a margin check to validate xres and yres settings.

Signed-off-by: George Kennedy <george.kennedy@oracle.com>
Reported-by: syzbot+e5fd3e65515b48c02a30@syzkaller.appspotmail.com
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Dhaval Giani <dhaval.giani@oracle.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1594149963-13801-1-git-send-email-george.kennedy@oracle.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
 		2021-03-16 16:39:23 +08:00
..
Makefile Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
bitblit.c fbcon: remove now unusued 'softback_lines' cursor() argument 2021-03-16 16:36:07 +08:00
cfbcopyarea.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
cfbfillrect.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
cfbimgblt.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fb_cmdline.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fb_ddc.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fb_defio.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fb_draw.h Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fb_notify.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fb_sys_fops.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fbcmap.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fbcon.c fbcon: Fix global-out-of-bounds read in fbcon_get_font() 2021-03-16 16:37:52 +08:00
fbcon.h fbdev, newport_con: Move FONT_EXTRA_WORDS macros into linux/font.h 2021-03-16 16:37:52 +08:00
fbcon_ccw.c fbcon: remove now unusued 'softback_lines' cursor() argument 2021-03-16 16:36:07 +08:00
fbcon_cw.c fbcon: remove now unusued 'softback_lines' cursor() argument 2021-03-16 16:36:07 +08:00
fbcon_rotate.c fbdev, newport_con: Move FONT_EXTRA_WORDS macros into linux/font.h 2021-03-16 16:37:52 +08:00
fbcon_rotate.h Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fbcon_ud.c fbcon: remove now unusued 'softback_lines' cursor() argument 2021-03-16 16:36:07 +08:00
fbcvt.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fbmem.c fbmem: add margin check to fb_check_caps() 2021-03-16 16:39:23 +08:00
fbmon.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
fbsysfs.c fbmem: pull fbcon_update_vcs() out of fb_set_var() 2021-03-16 16:35:18 +08:00
modedb.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
softcursor.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
svgalib.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
syscopyarea.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
sysfillrect.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
sysimgblt.c Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tileblit.c fbdev, newport_con: Move FONT_EXTRA_WORDS macros into linux/font.h 2021-03-16 16:37:52 +08:00