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Selvin Xavier a6c66d6a08 RDMA/bnxt_re: Avoid accessing the device structure after it is freed 
When bnxt_re_ib_reg returns failure, the device structure gets
freed. Driver tries to access the device pointer
after it is freed.

[ 4871.034744] Failed to register with netedev: 0xffffffa1
[ 4871.034765] infiniband (null): Failed to register with IB: 0xffffffea
[ 4871.046430] ==================================================================
[ 4871.046437] BUG: KASAN: use-after-free in bnxt_re_task+0x63/0x180 [bnxt_re]
[ 4871.046439] Write of size 4 at addr ffff880fa8406f48 by task kworker/u48:2/17813

[ 4871.046443] CPU: 20 PID: 17813 Comm: kworker/u48:2 Kdump: loaded Tainted: G B OE  4.20.0-rc1+ #42
[ 4871.046444] Hardware name: Dell Inc. PowerEdge R730/0599V5, BIOS 1.0.4 08/28/2014
[ 4871.046447] Workqueue: bnxt_re bnxt_re_task [bnxt_re]
[ 4871.046449] Call Trace:
[ 4871.046454]  dump_stack+0x91/0xeb
[ 4871.046458]  print_address_description+0x6a/0x2a0
[ 4871.046461]  kasan_report+0x176/0x2d0
[ 4871.046463]  ? bnxt_re_task+0x63/0x180 [bnxt_re]
[ 4871.046466]  bnxt_re_task+0x63/0x180 [bnxt_re]
[ 4871.046470]  process_one_work+0x216/0x5b0
[ 4871.046471]  ? process_one_work+0x189/0x5b0
[ 4871.046475]  worker_thread+0x4e/0x3d0
[ 4871.046479]  kthread+0x10e/0x140
[ 4871.046480]  ? process_one_work+0x5b0/0x5b0
[ 4871.046482]  ? kthread_stop+0x220/0x220
[ 4871.046486]  ret_from_fork+0x3a/0x50

[ 4871.046492] The buggy address belongs to the page:
[ 4871.046494] page:ffffea003ea10180 count:0 mapcount:0 mapping:0000000000000000 index:0x0
[ 4871.046495] flags: 0x57ffffc0000000()
[ 4871.046498] raw: 0057ffffc0000000 0000000000000000 ffffea003ea10188 0000000000000000
[ 4871.046500] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 4871.046501] page dumped because: kasan: bad access detected

Avoid accessing the device structure once it is freed.

Fixes: 497158aa5f ("RDMA/bnxt_re: Fix the ib_reg failure cleanup")
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
 		2018-11-21 14:12:21 -07:00
Documentation This pull request contains updates for UBIFS: 2018-11-04 14:46:04 -08:00
LICENSES This is a fairly typical cycle for documentation. There's some welcome 2018-10-24 18:01:11 +01:00
arch Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-11-03 18:25:17 -07:00
block for-linus-20181102 2018-11-02 11:25:48 -07:00
certs export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR() 2018-08-22 23:21:44 +09:00
crypto KEYS: asym_tpm: Add support for the sign operation [ver #2] 2018-10-26 09:30:47 +01:00
drivers RDMA/bnxt_re: Avoid accessing the device structure after it is freed 2018-11-21 14:12:21 -07:00
firmware kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
fs This pull request contains updates for UBIFS: 2018-11-04 14:46:04 -08:00
include net/mlx5: Fix XRC SRQ umem valid bits 2018-11-07 09:31:12 +02:00
init memblock: stop using implicit alignment to SMP_CACHE_BYTES 2018-10-31 08:54:16 -07:00
ipc ipc: IPCMNI limit check for semmni 2018-10-31 08:54:14 -07:00
kernel Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-11-03 18:37:09 -07:00
lib Merge branch 'work.afs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-11-01 19:58:52 -07:00
mm memory_hotplug: cond_resched in __remove_pages 2018-11-03 10:09:38 -07:00
net NFS client bugfixes for Linux 4.20 2018-11-04 08:20:09 -08:00
samples VFIO updates for v4.20 2018-10-31 11:01:38 -07:00
scripts Kbuild updates for v4.20 (2nd) 2018-11-03 10:47:33 -07:00
security + Features/Improvements 2018-11-02 10:04:26 -07:00
sound sound fixes for 4.20-rc1 2018-11-02 11:02:52 -07:00
tools Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-11-03 18:25:17 -07:00
usr initramfs: move gen_initramfs_list.sh from scripts/ to usr/ 2018-08-22 23:21:44 +09:00
virt Revert "mm, mmu_notifier: annotate mmu notifiers with blockable invalidate callbacks" 2018-10-26 16:25:19 -07:00
.clang-format page cache: Convert find_get_pages_contig to XArray 2018-10-21 10:46:34 -04:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.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 .mailmap: add Oleksij Rempel 2018-10-31 08:54:12 -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 The Compiler Attributes series 2018-11-01 18:34:46 -07:00
Makefile Linux 4.20-rc1 2018-11-04 15:37:52 -08:00
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.