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Zheyu Ma 030fadb013 video: fbdev: neofb: add a check against divide error The userspace program could pass any values to the driver through ioctl() interface. If the driver doesn't check the value of 'pixclock', it may cause divide error because of the 'PICOS2KHZ' macro. Fix this by checking whether 'pixclock' is zero first. The following log reveals it: [ 53.093806] divide error: 0000 [#1] PREEMPT SMP KASAN PTI [ 53.093838] CPU: 3 PID: 11763 Comm: hang Not tainted 5.14.0-rc2-00478-g2734d6c1b1a0 #215 [ 53.093859] RIP: 0010:neofb_check_var+0x80/0xe50 [ 53.093951] Call Trace: [ 53.093956] ? neofb_setcolreg+0x2b0/0x2b0 [ 53.093968] fb_set_var+0x2e4/0xeb0 [ 53.093977] ? fb_blank+0x1a0/0x1a0 [ 53.093984] ? lock_acquire+0x1ef/0x530 [ 53.093996] ? lock_release+0x810/0x810 [ 53.094005] ? lock_is_held_type+0x100/0x140 [ 53.094016] ? ___might_sleep+0x1ee/0x2d0 [ 53.094028] ? __mutex_lock+0x620/0x1190 [ 53.094036] ? do_fb_ioctl+0x313/0x700 [ 53.094044] ? mutex_lock_io_nested+0xfa0/0xfa0 [ 53.094051] ? __this_cpu_preempt_check+0x1d/0x30 [ 53.094060] ? _raw_spin_unlock_irqrestore+0x46/0x60 [ 53.094069] ? lockdep_hardirqs_on+0x59/0x100 [ 53.094076] ? _raw_spin_unlock_irqrestore+0x46/0x60 [ 53.094085] ? trace_hardirqs_on+0x6a/0x1c0 [ 53.094096] do_fb_ioctl+0x31e/0x700 Signed-off-by: Zheyu Ma <zheyuma97@gmail.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/1626871424-27708-1-git-send-email-zheyuma97@gmail.com		2021-07-21 15:02:03 +02:00
arch	drivers/firmware: consolidate EFI framebuffer setup for all arches	2021-07-21 12:04:56 +02:00
block	block-5.13-2021-05-22	2021-05-22 07:40:34 -10:00
certs	Kbuild updates for v5.13 (2nd)	2021-05-08 10:00:11 -07:00
crypto
Documentation	dma-buf: Delete the DMA-BUF attachment sysfs statistics	2021-07-20 11:06:59 +02:00
drivers	video: fbdev: neofb: add a check against divide error	2021-07-21 15:02:03 +02:00
fs	userfaultfd: hugetlbfs: fix new flag usage in error path	2021-05-22 15:09:07 -10:00
include	drivers/firmware: consolidate EFI framebuffer setup for all arches	2021-07-21 12:04:56 +02:00
init
ipc	ipc/mqueue, msg, sem: avoid relying on a stack reference past its expiry	2021-05-22 15:09:07 -10:00
kernel	Two locking fixes:	2021-05-23 06:30:08 -10:00
lib	lib: kunit: suppress a compilation warning of frame size	2021-05-22 15:09:07 -10:00
LICENSES
mm	userfaultfd: hugetlbfs: fix new flag usage in error path	2021-05-22 15:09:07 -10:00
net	Char/misc driver fixes for 5.13-rc3	2021-05-20 06:31:52 -10:00
samples	Kbuild updates for v5.13 (2nd)	2021-05-08 10:00:11 -07:00
scripts	kbuild: dummy-tools: adjust to stricter stackprotector check	2021-05-17 12:10:03 +09:00
security	trusted-keys: match tpm_get_ops on all return paths	2021-05-12 22:36:37 +03:00
sound	Merge tag 'asoc-hdmi-codec-improvements-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux into drm-misc-next	2021-06-23 14:32:27 +02:00
tools	powerpc fixes for 5.13 #4	2021-05-23 06:07:33 -10:00
usr
virt	kvm: Cap halt polling at kvm->max_halt_poll_ns	2021-05-07 06:06:22 -04:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap	Merge drm/drm-fixes into drm-misc-fixes	2021-05-11 13:35:52 +02:00
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS	drm/panel: ws2401: Add driver for WideChips WS2401	2021-07-17 13:10:29 +02:00
Makefile	Linux 5.13-rc3	2021-05-23 11:42:48 -10:00
README

README

Linux kernel
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There are several guides for kernel developers and users. These guides can
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In order to build the documentation, use ``make htmldocs`` or
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There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.