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Helge Deller 3270095f6e fbcon: Fix null-ptr-deref in soft_cursor 
commit d78bd6cc68276bd57f766f7cb98bfe32c23ab327 upstream.

syzbot repored this bug in the softcursor code:

BUG: KASAN: null-ptr-deref in soft_cursor+0x384/0x6b4 drivers/video/fbdev/core/softcursor.c:70
Read of size 16 at addr 0000000000000200 by task kworker/u4:1/12

CPU: 0 PID: 12 Comm: kworker/u4:1 Not tainted 6.4.0-rc3-syzkaller-geb0f1697d729 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Workqueue: events_power_efficient fb_flashcursor
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233
 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 print_report+0xe4/0x514 mm/kasan/report.c:465
 kasan_report+0xd4/0x130 mm/kasan/report.c:572
 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:187
 __asan_memcpy+0x3c/0x84 mm/kasan/shadow.c:105
 soft_cursor+0x384/0x6b4 drivers/video/fbdev/core/softcursor.c:70
 bit_cursor+0x113c/0x1a64 drivers/video/fbdev/core/bitblit.c:377
 fb_flashcursor+0x35c/0x54c drivers/video/fbdev/core/fbcon.c:380
 process_one_work+0x788/0x12d4 kernel/workqueue.c:2405
 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552
 kthread+0x288/0x310 kernel/kthread.c:379
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853

This fix let bit_cursor() bail out early when a font bitmap
isn't available yet.

Signed-off-by: Helge Deller <deller@gmx.de>
Reported-by: syzbot+d910bd780e6efac35869@syzkaller.appspotmail.com
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-06-09 10:34:26 +02:00
..
aty
drm pull for 6.1-rc1
2022-10-05 11:24:12 -07:00
core
fbcon: Fix null-ptr-deref in soft_cursor
2023-06-09 10:34:26 +02:00
geode
fbdev: lxfb: Fix potential divide by zero
2023-04-06 12:10:41 +02:00
i810
fbdev: Remove conflicting devices on PCI bus
2022-07-19 13:19:11 +02:00
intelfb
fbdev: intelfb: Fix potential divide by zero
2023-04-06 12:10:41 +02:00
kyro
fbdev: Remove conflicting devices on PCI bus
2022-07-19 13:19:11 +02:00
matrox
fbdev: matroxfb: G200eW: Increase max memory from 1 MB to 16 MB
2023-01-12 12:02:44 +01:00
mb862xx
fbdev: mb862xx: Fix check of return value from irq_of_parse_and_map()
2022-10-08 15:20:09 +02:00
mmp
fbdev: mmp: Fix deferred clk handling in mmphw_probe()
2023-05-11 23:03:31 +09:00
nvidia
fbdev: nvidia: Fix potential divide by zero
2023-04-06 12:10:41 +02:00
omap
fbdev: omap: Remove unnecessary print function dev_err()
2022-08-24 21:53:41 +02:00
omap2
fbdev: omapfb: avoid stack overflow warning
2023-01-24 07:24:32 +01:00
riva
fbdev: Remove conflicting devices on PCI bus
2022-07-19 13:19:11 +02:00
savage
fbdev: Remove conflicting devices on PCI bus
2022-07-19 13:19:11 +02:00
sis
fbdev: sisfb: use explicitly signed char
2022-10-24 20:28:41 +02:00
vermilion
fbdev: vermilion: decrease reference count in error path
2022-12-31 13:32:43 +01:00
via
fbdev: via: Fix error in via_core_init()
2022-12-31 13:32:43 +01:00
68328fb.c
video: fbdev: Make *fb_setup() and *fb_init() static
2022-07-18 07:54:20 +02:00
acornfb.c
video: fbdev: acornfb: remove free_unused_pages()
2021-02-24 13:38:31 -08:00
acornfb.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
amba-clcd.c
video: fbdev: amba-clcd: Fix refcount leak bugs
2022-07-26 08:56:22 +02:00
amifb.c
video: fbdev: amiga: Simplify amifb_pan_display()
2022-07-18 07:54:17 +02:00
arcfb.c
fbdev: arcfb: Fix error handling in arcfb_probe()
2023-05-24 17:32:33 +01:00
arkfb.c
fbdev: arkfb: Remove the unused function dac_read_reg()
2022-10-08 15:20:08 +02:00
asiliantfb.c
fbdev: Remove conflicting devices on PCI bus
2022-07-19 13:19:11 +02:00
atafb_iplan2p2.c
…
atafb_iplan2p4.c
…
atafb_iplan2p8.c
…
atafb_mfb.c
…
atafb_utils.h
…
atafb.c
video: fbdev: atari: Remove backward bug-compatibility
2022-07-18 07:56:18 +02:00
atafb.h
…
atmel_lcdfb.c
video: fbdev: atmel_lcdfb: fix an error code in atmel_lcdfb_probe()
2022-01-30 19:38:35 +01:00
au1100fb.c
video: fbdev: au1100fb: Drop unnecessary NULL ptr check
2022-06-20 20:19:50 +02:00
au1100fb.h
video: fbdev: au1100fb: Spelling s/palette/palette/
2022-02-16 10:54:42 +01:00
au1200fb.c
fbdev: au1200fb: Fix potential divide by zero
2023-04-06 12:10:41 +02:00
au1200fb.h
…
broadsheetfb.c
fbdev: Use pageref offset for deferred-I/O writeback
2022-05-03 16:04:22 +02:00
bt431.h
…
bt455.h
…
bw2.c
fbdev: Move fbdev drivers from strlcpy to strscpy
2022-08-24 22:06:15 +02:00
c2p_core.h
fbdev: c2p: Use BUILD_BUG() instead of custom solution
2020-03-09 11:12:19 +01:00
c2p_iplan2.c
…
c2p_planar.c
…
c2p.h
…
carminefb_regs.h
…
carminefb.c
fbdev: Remove conflicting devices on PCI bus
2022-07-19 13:19:11 +02:00
carminefb.h
…
cg3.c
video: fbdev: sparc drivers: fix kernel-doc warnings for blank_mode
2020-12-08 18:34:08 +01:00
cg6.c
video: fbdev: sparc drivers: fix kernel-doc warnings for blank_mode
2020-12-08 18:34:08 +01:00
cg14.c
fbdev: cg14fb: use resource_size
2020-01-15 17:31:50 +01:00
chipsfb.c
fbdev: chipsfb: Fix error codes in chipsfb_pci_init()
2023-03-22 13:33:39 +01:00
cirrusfb.c
drm pull for 6.1-rc1
2022-10-05 11:24:12 -07:00
clps711x-fb.c
fbdev: Move fbdev drivers from strlcpy to strscpy
2022-08-24 22:06:15 +02:00
cobalt_lcdfb.c
video: constify fb ops across all drivers
2019-12-05 10:57:53 +02:00
controlfb.c
fbdev: controlfb: Remove the unused function VAR_MATCH()
2022-10-08 15:20:08 +02:00
controlfb.h
…
cyber2000fb.c
fbdev: cyber2000fb: fix missing pci_disable_device()
2022-10-27 20:29:59 +02:00
cyber2000fb.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
da8xx-fb.c
fbdev: da8xx-fb: Fix error handling in .remove()
2022-10-18 10:22:28 +02:00
dnfb.c
video: fbdev: Make *fb_setup() and *fb_init() static
2022-07-18 07:54:20 +02:00
edid.h
…
efifb.c
Merge drm/drm-next into drm-misc-next
2022-06-20 18:21:25 +02:00
ep93xx-fb.c
fbdev: ep93xx-fb: Add missing clk_disable_unprepare in ep93xxfb_probe()
2022-12-31 13:32:43 +01:00
ffb.c
fbdev: Move fbdev drivers from strlcpy to strscpy
2022-08-24 22:06:15 +02:00
fm2fb.c
video: fbdev: Make *fb_setup() and *fb_init() static
2022-07-18 07:54:20 +02:00
fsl-diu-fb.c
video: fbdev: fsl-diu-fb: remove unneeded variable 'res'
2020-10-17 08:23:14 +02:00
g364fb.c
fbdev/g364fb: Fix build failure
2020-02-19 10:58:22 -08:00
gbefb.c
fbdev: gbefb: Convert sysfs snprintf to sysfs_emit
2022-10-18 10:28:41 +02:00
goldfishfb.c
video: fbdev: goldfishfb: Fix defined but not used warning
2020-12-08 18:34:50 +01:00
grvga.c
video: fbdev: Replace HTTP links with HTTPS ones
2020-07-20 11:47:29 +02:00
gxt4500.c
drm pull for 6.1-rc1
2022-10-05 11:24:12 -07:00
hecubafb.c
fbdev: Rename pagelist to pagereflist for deferred I/O
2022-05-03 16:04:22 +02:00
hgafb.c
video: hgafb: correctly handle card detect failure during probe
2021-05-21 15:04:05 +02:00
hitfb.c
mm: don't include asm/pgtable.h if linux/mm.h is already included
2020-06-09 09:39:13 -07:00
hpfb.c
video: fbdev: Make *fb_setup() and *fb_init() static
2022-07-18 07:54:20 +02:00
hyperv_fb.c
video: hyperv_fb: Avoid taking busy spinlock on panic path
2022-12-31 13:32:56 +01:00
i740_reg.h
…
i740fb.c
drm pull for 6.1-rc1
2022-10-05 11:24:12 -07:00
imsttfb.c
fbdev: imsttfb: Fix use after free bug in imsttfb_probe
2023-06-09 10:34:09 +02:00
imxfb.c
fbdev: imxfb: Remove redundant dev_err() call
2022-10-08 15:20:08 +02:00
Kconfig
fbdev: uvesafb: don't build on UML
2022-12-31 13:32:43 +01:00
leo.c
video: fbdev: sparc drivers: fix kernel-doc warnings for blank_mode
2020-12-08 18:34:08 +01:00
macfb.c
video: fbdev: Replace HTTP links with HTTPS ones
2020-07-20 11:47:29 +02:00
macmodes.c
…
macmodes.h
…
Makefile
ARM: omap1: move lcd_dma code into omapfb driver
2022-04-21 15:00:45 +02:00
maxinefb.c
video: constify fb ops across all drivers
2019-12-05 10:57:53 +02:00
metronomefb.c
fbdev: Use pageref offset for deferred-I/O writeback
2022-05-03 16:04:22 +02:00
mx3fb.c
dmaengine: imx: Move header to include/dma/
2022-04-19 12:06:18 +01:00
n411.c
…
neofb.c
fbdev: Remove conflicting devices on PCI bus
2022-07-19 13:19:11 +02:00
ocfb.c
video: fbdev: ocfb: add const to of_device_id
2022-01-29 22:24:25 +01:00
offb.c
video: fbdev: offb: Include missing linux/platform_device.h
2022-07-28 16:22:12 +10:00
p9100.c
video: fbdev: sparc drivers: fix kernel-doc warnings for blank_mode
2020-12-08 18:34:08 +01:00
platinumfb.c
video: fbdev: aty/matrox/...: Prepare cleanup of powerpc's asm/prom.h
2022-04-04 08:55:23 +02:00
platinumfb.h
…
pm2fb.c
fbdev: pm2fb: fix missing pci_disable_device()
2022-12-31 13:32:43 +01:00
pm3fb.c
fbdev: Remove conflicting devices on PCI bus
2022-07-19 13:19:11 +02:00
pmag-aa-fb.c
drm pull for 5.6-rc1
2020-01-30 08:04:01 -08:00
pmag-ba-fb.c
drm pull for 5.6-rc1
2020-01-30 08:04:01 -08:00
pmagb-b-fb.c
drm pull for 5.6-rc1
2020-01-30 08:04:01 -08:00
ps3fb.c
powerpc/ps3: make system bus's remove and shutdown callbacks return void
2020-12-04 01:01:22 +11:00
pvr2fb.c
fbdev: Remove conflicting devices on PCI bus
2022-07-19 13:19:11 +02:00
pxa3xx-gcu.c
video: fbdev: pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu_write
2022-06-20 20:12:17 +02:00
pxa3xx-gcu.h
…
pxa3xx-regs.h
ARM: pxa: move regs-lcd.h into driver
2022-04-19 16:29:03 +02:00
pxa168fb.c
fbdev: Move fbdev drivers from strlcpy to strscpy
2022-08-24 22:06:15 +02:00
pxa168fb.h
…
pxafb.c
fbdev: Move fbdev drivers from strlcpy to strscpy
2022-08-24 22:06:15 +02:00
pxafb.h
video: pxafb: Remove cpufreq policy notifier
2019-08-26 10:02:02 +02:00
q40fb.c
video: fbdev: Make *fb_setup() and *fb_init() static
2022-07-18 07:54:20 +02:00
s1d13xxxfb.c
video: fbdev: s1d13xxxfb: Fix kernel-doc and set but not used warnings
2020-11-29 22:51:07 +01:00
s3c2410fb-regs-lcd.h
fbdev: s3c2410fb: remove mach header dependency
2020-08-20 17:48:12 +02:00
s3c2410fb.c
fbdev: s3c2410fb: remove mach header dependency
2020-08-20 17:48:12 +02:00
s3c2410fb.h
…
s3c-fb.c
drm for 5.18-rc1
2022-03-24 16:19:43 -07:00
s3fb.c
drm pull for 6.1-rc1
2022-10-05 11:24:12 -07:00
sa1100fb.c
video: fbdev: sa1100fb: Remove unused sa1100fb_setup()
2022-07-18 07:54:18 +02:00
sa1100fb.h
ARM/fbdev: sa11x0: Switch to use GPIO descriptors
2020-04-17 15:50:11 +02:00
sbuslib.c
fbdev: sbuslib: remove compat_alloc_user_space usage
2020-09-25 16:34:50 +02:00
sbuslib.h
…
sh7760fb.c
drm pull for 5.6-rc1
2020-01-30 08:04:01 -08:00
sh_mobile_lcdcfb.c
fbdev: Use pageref offset for deferred-I/O writeback
2022-05-03 16:04:22 +02:00
sh_mobile_lcdcfb.h
fbdev/sh_mobile: remove sh_mobile_lcdc_display_notify
2019-06-12 20:28:11 +02:00
simplefb.c
fbdev: Move fbdev drivers from strlcpy to strscpy
2022-08-24 22:06:15 +02:00
skeletonfb.c
drm-misc-next for v6.1:
2022-09-06 10:56:04 +02:00
sm501fb.c
fbdev: sm501fb: Convert sysfs snprintf to sysfs_emit
2022-10-18 10:22:28 +02:00
sm712.h
…
sm712fb.c
fbdev: Remove conflicting devices on PCI bus
2022-07-19 13:19:11 +02:00
smscufx.c
fbdev: smscufx: fix error handling code in ufx_usb_probe
2023-02-09 11:28:27 +01:00
ssd1307fb.c
Merge tag 'v6.0-rc5' into i2c/for-mergewindow
2022-09-16 20:42:18 +01:00
sstfb.c
drm pull for 6.1-rc1
2022-10-05 11:24:12 -07:00
sticore.h
parisc/stifb: Keep track of hardware path of graphics card
2022-06-04 15:47:03 +02:00
stifb.c
fbdev: stifb: Fix info entry in sti_struct on error path
2023-06-09 10:34:09 +02:00
sunxvr500.c
drm pull for 6.1-rc1
2022-10-05 11:24:12 -07:00
sunxvr1000.c
fbdev: Move fbdev drivers from strlcpy to strscpy
2022-08-24 22:06:15 +02:00
sunxvr2500.c
drm pull for 6.1-rc1
2022-10-05 11:24:12 -07:00
tcx.c
fbdev: Move fbdev drivers from strlcpy to strscpy
2022-08-24 22:06:15 +02:00
tdfxfb.c
drm pull for 6.1-rc1
2022-10-05 11:24:12 -07:00
tgafb.c
fbdev: tgafb: Fix potential divide by zero
2023-04-06 12:10:40 +02:00
tmiofb.c
video: constify fb ops across all drivers
2019-12-05 10:57:53 +02:00
tridentfb.c
fbdev: tridentfb: Fix missing pci_disable_device() in probe and remove
2022-10-08 15:20:09 +02:00
udlfb.c
fbdev: udlfb: Fix endpoint check
2023-05-30 14:03:20 +01:00
uvesafb.c
fbdev: uvesafb: Fixes an error handling path in uvesafb_probe()
2022-12-31 13:32:43 +01:00
valkyriefb.c
video: fbdev: Make *fb_setup() and *fb_init() static
2022-07-18 07:54:20 +02:00
valkyriefb.h
…
vesafb.c
video: fbdev: vesafb: Fix a use-after-free due early fb_info cleanup
2022-05-28 19:26:56 +02:00
vfb.c
video: constify fb ops across all drivers
2019-12-05 10:57:53 +02:00
vga16fb.c
fbdev: vga16fb: Add missing MODULE_DEVICE_TABLE() entry
2022-10-08 15:20:09 +02:00
vt8500lcdfb.c
video: vt8500lcdfb: fix fallthrough warning
2020-04-17 15:50:08 +02:00
vt8500lcdfb.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282
2019-06-05 17:36:37 +02:00
vt8623fb.c
drm-misc-next for v6.1:
2022-09-06 10:56:04 +02:00
w100fb.c
video: fbdev: w100fb: Reset global state
2022-01-29 22:24:26 +01:00
w100fb.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
wm8505fb_regs.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282
2019-06-05 17:36:37 +02:00
wm8505fb.c
video: fbdev: wm8505fb: fix sparse warnings about using incorrect types
2020-03-02 16:32:04 +01:00
wmt_ge_rops.c
video: fbdev: wmt_ge_rops: Fix function not declared warnings
2020-12-08 18:34:36 +01:00
wmt_ge_rops.h
…
xen-fbfront.c
fbdev fixes and updates for kernel v5.19-rc1
2022-05-30 12:46:49 -07:00
xilinxfb.c
fbdev: xilinxfb: Make xilinxfb_release() return void
2022-10-20 08:36:41 +02:00