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linux/drivers/video/fbdev
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Michael Kelley 9ff5549b1d video: hyperv_fb: Fix validation of screen resolution 
In the WIN10 version of the Synthetic Video protocol with Hyper-V,
Hyper-V reports a list of supported resolutions as part of the protocol
negotiation. The driver calculates the maximum width and height from
the list of resolutions, and uses those maximums to validate any screen
resolution specified in the video= option on the kernel boot line.

This method of validation is incorrect. For example, the list of
supported resolutions could contain 1600x1200 and 1920x1080, both of
which fit in an 8 Mbyte frame buffer.  But calculating the max width
and height yields 1920 and 1200, and 1920x1200 resolution does not fit
in an 8 Mbyte frame buffer.  Unfortunately, this resolution is accepted,
causing a kernel fault when the driver accesses memory outside the
frame buffer.

Instead, validate the specified screen resolution by calculating
its size, and comparing against the frame buffer size.  Delete the
code for calculating the max width and height from the list of
resolutions, since these max values have no use.  Also add the
frame buffer size to the info message to aid in understanding why
a resolution might be rejected.

Fixes: 67e7cdb482 ("video: hyperv: hyperv_fb: Obtain screen resolution from Hyper-V host")
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Acked-by: Helge Deller <deller@gmx.de>
Link: https://lore.kernel.org/r/1642360711-2335-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
2022-01-24 14:01:12 +00:00
..
aty video: fbdev: atyfb: mach64_cursor.c: deleted the repeated word 2021-06-03 10:32:49 +02:00
core drm for 5.17-rc1 2022-01-10 12:58:46 -08:00
geode video: fbdev: lxfb_ops: Fix fall-through warnings for Clang 2020-11-22 22:58:55 +01:00
i810 video: fbdev: i810: use true,false for bool variables 2020-05-06 19:29:10 +02:00
intelfb drm pull for 5.6-rc1 2020-01-30 08:04:01 -08:00
kyro video: fbdev: kyro: Error out if 'pixclock' equals zero 2021-07-26 20:06:00 +02:00
matrox fbdev: matrox: use modern module_init() 2021-05-26 21:31:19 +02:00
mb862xx video: fbdev: mb862xx: use DEVICE_ATTR_RO macro 2021-06-03 10:32:49 +02:00
mmp video: fbdev: mmp: Fix kernel-doc warning for lcd_spi_write 2020-12-08 18:34:25 +01:00
nvidia video: fbdev: nvidia: Fix set but not used warnings 2020-11-30 20:21:54 +01:00
omap video: omapfb: Fix fall-through warning for Clang 2021-10-14 20:21:32 +02:00
omap2 video: omapfb: replace snprintf in show functions with sysfs_emit 2021-10-15 22:52:10 +02:00
riva video: fbdev: riva: Error out if 'pixclock' equals zero 2021-07-26 20:06:03 +02:00
savage fbdev: savagefb: use generic power management 2020-09-08 13:33:15 +02:00
sis video: fbdev: sis: Drop useless call to SiS_GetResInfo() 2020-12-08 18:36:52 +01:00
vermilion remove ioremap_nocache and devm_ioremap_nocache 2020-01-06 09:45:59 +01:00
via video: fbdev: via: Fix set but not used warning for mode_crt_table 2020-11-30 20:04:24 +01:00
68328fb.c video/fbdev/68328fb: Remove dead code 2020-01-03 14:27:43 +01:00
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 drm-misc-next for 5.13: 2021-03-16 17:08:46 +10:00
amifb.c backlight/video: Use Platform getter/setter functions 2021-02-12 10:01:45 +00:00
arcfb.c video: fbdev: arcfb: remove redundant initialization of variable err 2021-07-21 13:09:21 +02:00
arkfb.c fbdev: arkfb: use generic power management 2020-09-08 13:33:20 +02:00
asiliantfb.c video: fbdev: asiliantfb: Error out if 'pixclock' equals zero 2021-07-26 20:05:50 +02:00
atafb_iplan2p2.c fbdev: atafb: Remove obsolete module support 2019-04-01 17:46:55 +02:00
atafb_iplan2p4.c fbdev: atafb: Remove obsolete module support 2019-04-01 17:46:55 +02:00
atafb_iplan2p8.c fbdev: atafb: Remove obsolete module support 2019-04-01 17:46:55 +02:00
atafb_mfb.c fbdev: atafb: Remove obsolete module support 2019-04-01 17:46:55 +02:00
atafb_utils.h
atafb.c fbdev/atafb: Remove unused extern variables 2020-10-28 19:40:11 +01:00
atafb.h
atmel_lcdfb.c video: fbdev: atmel_lcdfb: fix return error code in atmel_lcdfb_of_init() 2020-11-17 08:47:15 +01:00
au1100fb.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
au1100fb.h au1100fb: fix DMA API abuse 2019-06-03 16:00:08 +02:00
au1200fb.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
au1200fb.h
broadsheetfb.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
bt431.h
bt455.h
bw2.c video: fbdev: sparc drivers: fix kernel-doc warnings for blank_mode 2020-12-08 18:34:08 +01:00
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 drm pull for 5.6-rc1 2020-01-30 08:04:01 -08:00
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 video: fbdev: chipsfb: use memset_io() instead of memset() 2021-10-09 00:15:59 +11:00
cirrusfb.c video: fbdev: cirrusfb: Fix kernel-doc and set but not used warnings 2020-12-05 21:16:02 +01:00
clps711x-fb.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
cobalt_lcdfb.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
controlfb.c video: fbdev: controlfb: Fix set but not used warnings 2020-12-08 18:36:36 +01:00
controlfb.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
cyber2000fb.c fbdev: cyber2000fb: use generic power management 2020-09-08 13:33:16 +02:00
cyber2000fb.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
da8xx-fb.c backlight/video: Use Platform getter/setter functions 2021-02-12 10:01:45 +00:00
dnfb.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
edid.h
efifb.c fbdev: Prevent probing generic drivers if a FB is already registered 2021-11-17 10:15:05 +01:00
ep93xx-fb.c video: ep93xx: Prepare clock before using it 2021-07-26 22:10:29 +02:00
ffb.c video: fbdev: sparc drivers: fix kernel-doc warnings for blank_mode 2020-12-08 18:34:08 +01:00
fm2fb.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +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 video: fbdev: gbefb: Only instantiate device when built for IP32 2021-10-06 11:12:28 +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 treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
hecubafb.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +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 maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault 2020-06-17 10:57:41 -07:00
hyperv_fb.c video: hyperv_fb: Fix validation of screen resolution 2022-01-24 14:01:12 +00:00
i740_reg.h
i740fb.c fbdev: i740fb: use generic power management 2020-09-08 13:33:17 +02:00
imsttfb.c video: imsttfb: check for ioremap() failures 2021-05-13 18:58:39 +02:00
imxfb.c video: fbdev: imxfb: Fix an error message 2021-05-07 18:34:18 +02:00
Kconfig fbdev: simplefb: fix Kconfig dependencies 2021-10-06 11:12:28 +02:00
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 drm next for 5.10-rc1 2020-10-15 10:46:16 -07:00
maxinefb.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
metronomefb.c video: fbdev: Replace HTTP links with HTTPS ones 2020-07-20 11:47:29 +02:00
mx3fb.c video: fbdev: mx3fb: Fix kernel-doc, set but not used and string warnings 2020-11-30 20:04:56 +01:00
n411.c
neofb.c video: fbdev: neofb: add a check against divide error 2021-07-21 15:02:03 +02:00
ocfb.c video: ocfb: Use devm_platform_ioremap_resource() in ocfb_probe() 2020-01-03 14:27:49 +01:00
offb.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
p9100.c video: fbdev: sparc drivers: fix kernel-doc warnings for blank_mode 2020-12-08 18:34:08 +01:00
platinumfb.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
platinumfb.h
pm2fb.c video: fbdev: pm2fb: Fix kernel-doc warnings 2020-11-30 20:04:43 +01:00
pm3fb.c treewide: Remove uninitialized_var() usage 2020-07-16 12:35:15 -07:00
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 video: fbdev: pvr2fb: initialize variables 2020-08-05 19:47:22 +02:00
pxa3xx-gcu.c misc: cleanup minor number definitions in c file into miscdevice.h 2020-03-18 12:27:03 +01:00
pxa3xx-gcu.h
pxa168fb.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
pxa168fb.h
pxafb.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
pxafb.h video: pxafb: Remove cpufreq policy notifier 2019-08-26 10:02:02 +02:00
q40fb.c mm: don't include asm/pgtable.h if linux/mm.h is already included 2020-06-09 09:39:13 -07:00
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 video: fbdev: s3c-fb: Fix kernel-doc and set but not used warnings 2020-12-05 21:01:04 +01:00
s3fb.c fbdev: s3fb: use generic power management 2020-09-08 13:33:19 +02:00
sa1100fb.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
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/sh_mobile: Drop unused include 2020-11-01 10:29:04 +01:00
sh_mobile_lcdcfb.h fbdev/sh_mobile: remove sh_mobile_lcdc_display_notify 2019-06-12 20:28:11 +02:00
simplefb.c Merge drm/drm-next into drm-misc-next 2021-12-16 14:48:27 +01:00
skeletonfb.c fbdev: Garbage collect fbdev scrolling acceleration, part 1 (from TODO list) 2021-10-13 15:29:23 +02:00
sm501fb.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
sm712.h fbdev: sm712fb: use 1024x768 by default on non-MIPS, fix garbled display 2019-04-01 17:46:59 +02:00
sm712fb.c fbdev: sm712fb: handle ioremap() errors in probe 2020-09-08 13:33:02 +02:00
smscufx.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
ssd1307fb.c video: fbdev: ssd1307fb: Cache address ranges 2021-07-27 17:18:26 +02:00
sstfb.c video: fbdev: sstfb: Updated logging to fix set but not used warnings 2020-11-30 20:04:59 +01:00
sticore.h parisc/sticon: Add user font support 2020-10-15 08:12:59 +02:00
stifb.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
sunxvr500.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
sunxvr1000.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
sunxvr2500.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
tcx.c video: fbdev: sparc drivers: fix kernel-doc warnings for blank_mode 2020-12-08 18:34:08 +01:00
tdfxfb.c video: fbdev: tdfx: Fix set but not used warning in att_outb() 2020-11-30 20:04:30 +01:00
tgafb.c video: fbdev: tgafb: Fix kernel-doc and set but not used warnings 2020-11-30 20:04:50 +01:00
tmiofb.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
tridentfb.c drm pull for 5.6-rc1 2020-01-30 08:04:01 -08:00
udlfb.c udlfb: Fix memory leak in dlfb_usb_probe 2020-12-15 13:44:14 +01:00
uvesafb.c video: fbdev: uvesafb: Fix set but not used warning 2020-12-08 18:33:48 +01:00
valkyriefb.c video: fbdev: valkyriefb.c: fix warning comparing pointer to 0 2020-05-06 21:04:45 +02:00
valkyriefb.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
vesafb.c video: fbdev: vesafb: add missed release_region 2020-04-17 15:50:14 +02:00
vfb.c video: constify fb ops across all drivers 2019-12-05 10:57:53 +02:00
vga16fb.c video: vga16fb: Only probe for EGA and VGA 16 color graphic cards 2022-01-12 11:14:42 +01:00
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 fbdev: vt8623fb: use generic power management 2020-09-08 13:33:18 +02:00
w100fb.c video: fbdev: w100fb: Fix a potential double free. 2020-05-06 20:22:25 +02:00
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 xen: add "not_essential" flag to struct xenbus_driver 2021-11-23 13:41:29 -06:00
xilinxfb.c video: fbdev: Fix fall-through warning for Clang 2021-07-13 13:58:29 -05:00