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Bart Van Assche f5c2976e0c scsi: ufs: core: Fix a race condition related to device management 
If a device management command completion happens after
wait_for_completion_timeout() times out and before ufshcd_clear_cmds() is
called, then the completion code may crash on the complete() call in
__ufshcd_transfer_req_compl().

Fix the following crash:

  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008
  Call trace:
   complete+0x64/0x178
   __ufshcd_transfer_req_compl+0x30c/0x9c0
   ufshcd_poll+0xf0/0x208
   ufshcd_sl_intr+0xb8/0xf0
   ufshcd_intr+0x168/0x2f4
   __handle_irq_event_percpu+0xa0/0x30c
   handle_irq_event+0x84/0x178
   handle_fasteoi_irq+0x150/0x2e8
   __handle_domain_irq+0x114/0x1e4
   gic_handle_irq.31846+0x58/0x300
   el1_irq+0xe4/0x1c0
   efi_header_end+0x110/0x680
   __irq_exit_rcu+0x108/0x124
   __handle_domain_irq+0x118/0x1e4
   gic_handle_irq.31846+0x58/0x300
   el1_irq+0xe4/0x1c0
   cpuidle_enter_state+0x3ac/0x8c4
   do_idle+0x2fc/0x55c
   cpu_startup_entry+0x84/0x90
   kernel_init+0x0/0x310
   start_kernel+0x0/0x608
   start_kernel+0x4ec/0x608

Link: https://lore.kernel.org/r/20220720170228.1598842-1-bvanassche@acm.org
Fixes: 5a0b0cb9be ("[SCSI] ufs: Add support for sending NOP OUT UPIU")
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Avri Altman <avri.altman@wdc.com>
Cc: Bean Huo <beanhuo@micron.com>
Cc: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
History 2022-07-26 21:59:29 -04:00
arch Hot fixes for 5.19-rc1. 2022-06-05 17:05:38 -07:00
block for-5.19/drivers-2022-06-02 2022-06-03 10:25:56 -07:00
certs Kbuild updates for v5.19 2022-05-26 12:09:50 -07:00
crypto This update includes the following changes: 2022-05-27 18:06:49 -07:00
Documentation A single featurelet for delay accounting. Delayed a bit 2022-06-05 16:58:27 -07:00
drivers scsi: ufs: core: Fix a race condition related to device management 2022-07-26 21:59:29 -04:00
fs fix for breakage in #work.fd this window 2022-06-05 17:14:03 -07:00
include A single featurelet for delay accounting. Delayed a bit 2022-06-05 16:58:27 -07:00
init This set of changes updates init and user mode helper tasks to be 2022-06-03 16:03:05 -07:00
ipc These changes update the ipc sysctls so that they are fundamentally 2022-06-03 15:54:57 -07:00
kernel A single featurelet for delay accounting. Delayed a bit 2022-06-05 16:58:27 -07:00
lib Bitmap patches for 5.19-rc1 2022-06-04 14:04:27 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm Hot fixes for 5.19-rc1. 2022-06-05 17:05:38 -07:00
net bluetooth: don't use bitmaps for random flag accesses 2022-06-05 16:28:41 -07:00
samples drm for 5.19-rc1 2022-05-25 16:18:27 -07:00
scripts A set of objtool fixes: 2022-06-05 09:45:27 -07:00
security Cleanups (and one fix) around struct mount handling. 2022-06-04 19:00:05 -07:00
sound USB / Thunderbolt changes for 5.19-rc1 2022-06-03 11:17:49 -07:00
tools A single featurelet for delay accounting. Delayed a bit 2022-06-05 16:58:27 -07:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt VFIO updates for v5.19-rc1 2022-06-01 13:49:15 -07:00
.clang-format clang-format: Fix space after for_each macros 2022-05-20 19:27:16 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
.mailmap Hot fixes for 5.19-rc1. 2022-06-05 17:05:38 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Hot fixes for 5.19-rc1. 2022-06-05 17:05:38 -07:00
Makefile Linux 5.19-rc1 2022-06-05 17:18:54 -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.