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Tang Junhui cc40daf91b bcache: fix crashes in duplicate cache device register Kernel crashed when register a duplicate cache device, the call trace is bellow: [ 417.643790] CPU: 1 PID: 16886 Comm: bcache-register Tainted: G W OE 4.15.5-amd64-preempt-sysrq-20171018 #2 [ 417.643861] Hardware name: LENOVO 20ERCTO1WW/20ERCTO1WW, BIOS N1DET41W (1.15 ) 12/31/2015 [ 417.643870] RIP: 0010:bdevname+0x13/0x1e [ 417.643876] RSP: 0018:ffffa3aa9138fd38 EFLAGS: 00010282 [ 417.643884] RAX: 0000000000000000 RBX: ffff8c8f2f2f8000 RCX: ffffd6701f8 c7edf [ 417.643890] RDX: ffffa3aa9138fd88 RSI: ffffa3aa9138fd88 RDI: 00000000000 00000 [ 417.643895] RBP: ffffa3aa9138fde0 R08: ffffa3aa9138fae8 R09: 00000000000 1850e [ 417.643901] R10: ffff8c8eed34b271 R11: ffff8c8eed34b250 R12: 00000000000 00000 [ 417.643906] R13: ffffd6701f78f940 R14: ffff8c8f38f80000 R15: ffff8c8ea7d 90000 [ 417.643913] FS: 00007fde7e66f500(0000) GS:ffff8c8f61440000(0000) knlGS: 0000000000000000 [ 417.643919] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 417.643925] CR2: 0000000000000314 CR3: 00000007e6fa0001 CR4: 00000000003 606e0 [ 417.643931] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 00000000000 00000 [ 417.643938] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 00000000000 00400 [ 417.643946] Call Trace: [ 417.643978] register_bcache+0x1117/0x1270 [bcache] [ 417.643994] ? slab_pre_alloc_hook+0x15/0x3c [ 417.644001] ? slab_post_alloc_hook.isra.44+0xa/0x1a [ 417.644013] ? kernfs_fop_write+0xf6/0x138 [ 417.644020] kernfs_fop_write+0xf6/0x138 [ 417.644031] __vfs_write+0x31/0xcc [ 417.644043] ? current_kernel_time64+0x10/0x36 [ 417.644115] ? __audit_syscall_entry+0xbf/0xe3 [ 417.644124] vfs_write+0xa5/0xe2 [ 417.644133] SyS_write+0x5c/0x9f [ 417.644144] do_syscall_64+0x72/0x81 [ 417.644161] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 417.644169] RIP: 0033:0x7fde7e1c1974 [ 417.644175] RSP: 002b:00007fff13009a38 EFLAGS: 00000246 ORIG_RAX: `0000000` 000000001 [ 417.644183] RAX: ffffffffffffffda RBX: 0000000001658280 RCX: 00007fde7e1c 1974 [ 417.644188] RDX: 000000000000000a RSI: 0000000001658280 RDI: 000000000000 0001 [ 417.644193] RBP: 000000000000000a R08: 0000000000000003 R09: 000000000000 0077 [ 417.644198] R10: 000000000000089e R11: 0000000000000246 R12: 000000000000 0001 [ 417.644203] R13: 000000000000000a R14: 7fffffffffffffff R15: 000000000000 0000 [ 417.644213] Code: c7 c2 83 6f ee 98 be 20 00 00 00 48 89 df e8 6c 27 3b 0 0 48 89 d8 5b c3 0f 1f 44 00 00 48 8b 47 70 48 89 f2 48 8b bf 80 00 00 00 <8 b> b0 14 03 00 00 e9 73 ff ff ff 0f 1f 44 00 00 48 8b 47 40 39 [ 417.644302] RIP: bdevname+0x13/0x1e RSP: ffffa3aa9138fd38 [ 417.644306] CR2: 0000000000000314 When registering duplicate cache device in register_cache(), after failure on calling register_cache_set(), bch_cache_release() will be called, then bdev will be freed, so bdevname(bdev, name) caused kernel crash. Since bch_cache_release() will free bdev, so in this patch we make sure bdev being freed if register_cache() fail, and do not free bdev again in register_bcache() when register_cache() fail. Signed-off-by: Tang Junhui <tang.junhui@zte.com.cn> Reported-by: Marc MERLIN <marc@merlins.org> Tested-by: Michael Lyle <mlyle@lyle.org> Reviewed-by: Michael Lyle <mlyle@lyle.org> Cc: <stable@vger.kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>		2018-03-05 14:43:05 -07:00
arch	Merge branch 'x86/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-03-04 12:12:48 -08:00
block	for-linus-20180302	2018-03-02 09:35:36 -08:00
certs	certs/blacklist_nohashes.c: fix const confusion in certs blacklist	2018-02-21 15:35:43 -08:00
crypto	X.509: fix NULL dereference when restricting key with unsupported_sig	2018-02-22 14:38:34 +00:00
Documentation	Merge branch 'x86/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-03-04 12:12:48 -08:00
drivers	bcache: fix crashes in duplicate cache device register	2018-03-05 14:43:05 -07:00
firmware	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
fs	for-4.16-rc3-tag	2018-03-04 11:04:27 -08:00
include	Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm	2018-03-03 14:32:00 -08:00
init	jump_label: Explicitly disable jump labels in __init code	2018-02-21 16:54:05 +01:00
ipc	vfs: do bulk POLL* -> EPOLL* replacement	2018-02-11 14:34:03 -08:00
kernel	Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-03-04 11:34:49 -08:00
lib	A single fix for a memory leak regression in the dma-debug code.	2018-02-28 11:13:08 -08:00
LICENSES	LICENSES: Add MPL-1.1 license	2018-01-06 10:59:44 -07:00
mm	mm: don't defer struct page initialization for Xen pv guests	2018-02-21 15:35:43 -08:00
net	libceph, ceph: avoid memory leak when specifying same option several times	2018-02-26 16:19:30 +01:00
samples	- do not build samples when cross compiling (Michal Hocko)	2018-02-27 10:39:29 -08:00
scripts	Kbuild fixes for v4.16	2018-03-03 10:37:01 -08:00
security	integrity/security: fix digsig.c build error with header file	2018-02-22 20:09:08 -08:00
sound	ALSA: x86: Fix potential crash at error path	2018-02-28 08:46:00 +01:00
tools	Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2018-03-04 11:40:16 -08:00
usr	initramfs: fix initramfs rebuilds w/ compression after disabling	2017-11-03 07:39:19 -07:00
virt	KVM: mmu: Fix overlap between public and private memslots	2018-02-24 01:43:36 +01:00
.cocciconfig
.get_maintainer.ignore
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	.gitignore: ignore ASN.1 auto generated files	2018-02-14 21:05:38 +01:00
.mailmap	mailmap: update Mark Yao's email address	2018-01-04 16:45:09 -08:00
COPYING
CREDITS	MAINTAINERS: update TPM driver infrastructure changes	2017-11-09 17:58:40 -08:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
MAINTAINERS	Kbuild fixes for v4.16	2018-03-03 10:37:01 -08:00
Makefile	Linux 4.16-rc4	2018-03-04 14:54:11 -08:00
README	README: add a new README file, pointing to the Documentation/	2016-10-24 08:12:35 -02:00

README

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

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.