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He, Bo 2f4052ffd9 HID: debug: fix race condition with between rdesc_show() and device removal 
[ Upstream commit cef0d4948c ]

There is a race condition that could happen if hid_debug_rdesc_show()
is running while hdev is in the process of going away (device removal,
system suspend, etc) which could result in NULL pointer dereference:

	 BUG: unable to handle kernel paging request at 0000000783316040
	 CPU: 1 PID: 1512 Comm: getevent Tainted: G     U     O 4.19.20-quilt-2e5dc0ac-00029-gc455a447dd55 #1
	 RIP: 0010:hid_dump_device+0x9b/0x160
	 Call Trace:
	  hid_debug_rdesc_show+0x72/0x1d0
	  seq_read+0xe0/0x410
	  full_proxy_read+0x5f/0x90
	  __vfs_read+0x3a/0x170
	  vfs_read+0xa0/0x150
	  ksys_read+0x58/0xc0
	  __x64_sys_read+0x1a/0x20
	  do_syscall_64+0x55/0x110
	  entry_SYSCALL_64_after_hwframe+0x49/0xbe

Grab driver_input_lock to make sure the input device exists throughout the
whole process of dumping the rdesc.

[jkosina@suse.cz: update changelog a bit]
Signed-off-by: he, bo <bo.he@intel.com>
Signed-off-by: "Zhang, Jun" <jun.zhang@intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-05-08 07:21:45 +02:00
arch arm64: dts: rockchip: fix rk3328-roc-cc gmac2io tx/rx_delay 2019-05-08 07:21:45 +02:00
block blk-iolatency: #include "blk.h" 2019-04-20 09:15:58 +02:00
certs export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR() 2018-08-22 23:21:44 +09:00
crypto crypto: x86/poly1305 - fix overflow during partial reduction 2019-04-27 09:36:37 +02:00
Documentation USB: core: Fix bug caused by duplicate interface PM usage counter 2019-05-08 07:21:44 +02:00
drivers HID: debug: fix race condition with between rdesc_show() and device removal 2019-05-08 07:21:45 +02:00
firmware kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
fs ceph: fix use-after-free on symlink traversal 2019-05-04 09:20:21 +02:00
include USB: core: Fix bug caused by duplicate interface PM usage counter 2019-05-08 07:21:44 +02:00
init Revert "mm: use early_pfn_to_nid in page_ext_init" 2019-03-23 20:09:46 +01:00
ipc ipc/shm.c: use ERR_CAST() for shm_lock() error return 2018-10-05 16:32:04 -07:00
kernel ptrace: take into account saved_sigmask in PTRACE{GET,SET}SIGMASK 2019-05-04 09:20:22 +02:00
lib lib/Kconfig.debug: fix build error without CONFIG_BLOCK 2019-05-02 09:58:53 +02:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
mm mm: prevent get_user_pages() from overflowing page refcount 2019-05-04 09:20:11 +02:00
net mac80211: don't attempt to rename ERR_PTR() debugfs dirs 2019-05-08 07:21:42 +02:00
samples samples: mei: use /dev/mei0 instead of /dev/mei 2019-02-15 08:10:11 +01:00
scripts kconfig/[mn]conf: handle backspace (^H) key 2019-05-04 09:20:22 +02:00
security selinux: use kernel linux/socket.h for genheaders and mdp 2019-05-04 09:20:10 +02:00
sound ALSA: hda/realtek - Apply the fixup for ASUS Q325UAR 2019-05-08 07:21:43 +02:00
tools selftests: fib_rule_tests: print the result and return 1 if any tests failed 2019-05-05 14:42:39 +02:00
usr initramfs: move gen_initramfs_list.sh from scripts/ to usr/ 2018-08-22 23:21:44 +09:00
virt KVM: arm/arm64: vgic-its: Take the srcu lock when parsing the memslots 2019-05-04 09:20:14 +02:00
.clang-format clang-format: Set IndentWrappedFunctionNames false 2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
.mailmap libnvdimm-for-4.19_misc 2018-08-25 18:13:10 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS 9p: remove Ron Minnich from MAINTAINERS 2018-08-17 16:20:26 -07:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS platform/x86: Add Intel AtomISP2 dummy / power-management driver 2019-04-20 09:16:02 +02:00
Makefile Linux 4.19.40 2019-05-05 14:42:41 +02:00
README Docs: Added a pointer to the formatted docs to README 2018-03-21 09:02:53 -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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.