WSL2-Linux-Kernel

The source for the Linux kernel used in Windows Subsystem for Linux 2 (WSL2)

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YueHaibing 5caaf29af5 spi: bitbang: Fix NULL pointer dereference in spi_unregister_master If spi_register_master fails in spi_bitbang_start because device_add failure, We should return the error code other than 0, otherwise calling spi_bitbang_stop may trigger NULL pointer dereference like this: BUG: KASAN: null-ptr-deref in __list_del_entry_valid+0x45/0xd0 Read of size 8 at addr 0000000000000000 by task syz-executor.0/3661 CPU: 0 PID: 3661 Comm: syz-executor.0 Not tainted 5.1.0+ #28 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 Call Trace: dump_stack+0xa9/0x10e ? __list_del_entry_valid+0x45/0xd0 ? __list_del_entry_valid+0x45/0xd0 __kasan_report+0x171/0x18d ? __list_del_entry_valid+0x45/0xd0 kasan_report+0xe/0x20 __list_del_entry_valid+0x45/0xd0 spi_unregister_controller+0x99/0x1b0 spi_lm70llp_attach+0x3ae/0x4b0 [spi_lm70llp] ? 0xffffffffc1128000 ? klist_next+0x131/0x1e0 ? driver_detach+0x40/0x40 [parport] port_check+0x3b/0x50 [parport] bus_for_each_dev+0x115/0x180 ? subsys_dev_iter_exit+0x20/0x20 __parport_register_driver+0x1f0/0x210 [parport] ? 0xffffffffc1150000 do_one_initcall+0xb9/0x3b5 ? perf_trace_initcall_level+0x270/0x270 ? kasan_unpoison_shadow+0x30/0x40 ? kasan_unpoison_shadow+0x30/0x40 do_init_module+0xe0/0x330 load_module+0x38eb/0x4270 ? module_frob_arch_sections+0x20/0x20 ? kernel_read_file+0x188/0x3f0 ? find_held_lock+0x6d/0xd0 ? fput_many+0x1a/0xe0 ? __do_sys_finit_module+0x162/0x190 __do_sys_finit_module+0x162/0x190 ? __ia32_sys_init_module+0x40/0x40 ? __mutex_unlock_slowpath+0xb4/0x3f0 ? wait_for_completion+0x240/0x240 ? vfs_write+0x160/0x2a0 ? lockdep_hardirqs_off+0xb5/0x100 ? mark_held_locks+0x1a/0x90 ? do_syscall_64+0x14/0x2a0 do_syscall_64+0x72/0x2a0 entry_SYSCALL_64_after_hwframe+0x49/0xbe Reported-by: Hulk Robot <hulkci@huawei.com> Fixes: `702a4879ec` ("spi: bitbang: Let spi_bitbang_start() take a reference to master") Signed-off-by: YueHaibing <yuehaibing@huawei.com> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Axel Lin <axel.lin@ingics.com> Reviewed-by: Mukesh Ojha <mojha@codeaurora.org> Signed-off-by: Mark Brown <broonie@kernel.org>		2019-05-16 11:16:43 +01:00
Documentation	dt-bindings: spi: spi-mt65xx: add support for MT8516	2019-05-02 10:37:54 +09:00
LICENSES	LICENSES: Add GCC runtime library exception text	2019-01-16 14:54:15 -07:00
arch	spi: ep93xx: Convert to use CS GPIO descriptors	2019-05-02 10:37:59 +09:00
block	for-5.1/block-post-20190315	2019-03-16 12:36:39 -07:00
certs	kexec, KEYS: Make use of platform keyring for signature verify	2019-02-04 17:34:07 -05:00
crypto	lib/lzo: separate lzo-rle from lzo	2019-03-07 18:32:03 -08:00
drivers	spi: bitbang: Fix NULL pointer dereference in spi_unregister_master	2019-05-16 11:16:43 +01:00
fs	Pull request for inlusion in 5.1	2019-03-17 09:10:56 -07:00
include	spi: ep93xx: Convert to use CS GPIO descriptors	2019-05-02 10:37:59 +09:00
init	init/main: add checks for the return value of memblock_alloc*()	2019-03-12 10:04:02 -07:00
ipc	Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-03-12 14:08:19 -07:00
kernel	pidfd patches for v5.1-rc1	2019-03-16 13:47:14 -07:00
lib	Kbuild updates for v5.1 (2nd)	2019-03-17 13:25:26 -07:00
mm	device-dax for 5.1	2019-03-16 13:05:32 -07:00
net	Pull request for inlusion in 5.1	2019-03-17 09:10:56 -07:00
samples	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2019-03-11 08:54:01 -07:00
scripts	kconfig: remove stale lxdialog/.gitignore	2019-03-17 15:47:02 +09:00
security	selinux/stable-5.1 PR 20190312	2019-03-13 11:10:42 -07:00
sound	spi: AD ASoC: declare missing of table	2019-05-02 10:37:58 +09:00
tools	pidfd patches for v5.1-rc1	2019-03-16 13:47:14 -07:00
usr	user/Makefile: Fix typo and capitalization in comment section	2018-12-11 00:18:03 +09:00
virt	ARM: some cleanups, direct physical timer assignment, cache sanitization	2019-03-15 15:00:28 -07:00
.clang-format	Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-03-12 13:43:42 -07:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	Add hch to .get_maintainer.ignore	2015-08-21 14:30:10 -07:00
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	kbuild: Add support for DT binding schema checks	2018-12-13 09:41:32 -06:00
.mailmap	.mailmap: Add Mathieu Othacehe	2019-02-21 11:41:19 +00:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	Char/Misc driver patches for 5.1-rc1	2019-03-06 14:18:59 -08:00
Kbuild	Kbuild updates for v5.1	2019-03-10 17:48:21 -07:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	ARM: some cleanups, direct physical timer assignment, cache sanitization	2019-03-15 15:00:28 -07:00
Makefile	Linux 5.1-rc1	2019-03-17 14:22:26 -07:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

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.