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Sudeep Holla 9905f728b0 mailbox: arm_mhu_db: Fix mhu_db_shutdown by replacing kfree with devm_kfree 
The mhu_db_channel info is allocated per channel using devm_kzalloc from
mhu_db_mbox_xlate which gets called from mbox_request_channel. However
we are releasing the allocated mhu_db_channel info using plain kfree from
mhu_db_shutdown which is called from mbox_free_channel.

This leads to random crashes when the channel is freed like below one:

  Unable to handle kernel paging request at virtual address 0080000400000008
  [0080000400000008] address between user and kernel address ranges
  Internal error: Oops: 96000044 [#1] PREEMPT SMP
  Modules linked in: scmi_module(-)
  CPU: 1 PID: 2212 Comm: rmmod Not tainted 5.10.0-rc5 #31
  Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno
  	Development Platform, BIOS EDK II Nov 19 2020
  pstate: 20000085 (nzCv daIf -PAN -UAO -TCO BTYPE=--)
  pc : release_nodes+0x74/0x230
  lr : devres_release_all+0x40/0x68
  Call trace:
   release_nodes+0x74/0x230
   devres_release_all+0x40/0x68
   device_release_driver_internal+0x12c/0x1f8
   driver_detach+0x58/0xe8
   bus_remove_driver+0x64/0xe0
   driver_unregister+0x38/0x68
   platform_driver_unregister+0x1c/0x28
   scmi_driver_exit+0x38/0x44 [scmi_module]
   __arm64_sys_delete_module+0x188/0x260
   el0_svc_common.constprop.0+0x80/0x1a8
   do_el0_svc+0x2c/0x98
   el0_sync_handler+0x160/0x168
   el0_sync+0x174/0x180
  Code: 1400000d eb07009f 54000460 f9400486 (f90004a6)
  ---[ end trace c55ffd306c140233 ]---

Fix it by replacing kfree with devm_kfree as required.

Fixes: 7002ca237b ("mailbox: arm_mhu: Add ARM MHU doorbell driver")
Reported-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Tested-by: Cristian Marussi <cristian.marussi@arm.com>
Reviewed-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
2020-12-01 19:17:20 -06:00
arch Yet two more places which invoke tracing from RCU disabled regions in the 2020-11-29 11:19:26 -08:00
block block/keyslot-manager: prevent crash when num_slots=1 2020-11-20 11:52:52 -07:00
certs .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
crypto drivers-5.10-2020-10-12 2020-10-13 13:04:41 -07:00
Documentation Tracing fixes for 5.10-rc6 2020-12-01 15:30:18 -08:00
drivers mailbox: arm_mhu_db: Fix mhu_db_shutdown by replacing kfree with devm_kfree 2020-12-01 19:17:20 -06:00
fs cifs: fix potential use-after-free in cifs_echo_request() 2020-11-30 15:23:45 -06:00
include Tracing fixes for 5.10-rc6 2020-12-01 15:30:18 -08:00
init Urgent printk fix for 5.10 2020-11-27 10:38:36 -08:00
ipc ipc: adjust proc_ipc_sem_dointvec definition to match prototype 2020-09-05 12:14:29 -07:00
kernel Tracing fixes for 5.10-rc6 2020-12-01 15:30:18 -08:00
lib lib/strncpy_from_user.c: Mask out bytes after NUL terminator. 2020-11-19 11:56:16 -08:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
mm mm: fix VM_BUG_ON(PageTail) and BUG_ON(PageWriteback) 2020-11-24 15:23:19 -08:00
net linux-can-fixes-for-5.10-20201127 2020-11-27 11:13:39 -08:00
samples Tracing fixes for 5.10-rc6 2020-12-01 15:30:18 -08:00
scripts Kbuild fixes for v5.10 2020-11-28 10:42:30 -08:00
security selinux/stable-5.10 PR 20201113 2020-11-14 12:04:02 -08:00
sound ASoC: Fixes for v5.11 2020-11-19 19:56:29 +01:00
tools Tracing fixes for 5.10-rc6 2020-12-01 15:30:18 -08:00
usr Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 13:29:39 -07:00
virt kvm: x86/mmu: Support dirty logging for the TDP MMU 2020-10-23 03:42:13 -04:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.cocciconfig
.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 .gitignore: docs: ignore sphinx_*/ directories 2020-09-10 10:44:31 -06:00
.mailmap ARM: 2020-11-27 11:04:13 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS Samsung changes for v5.10 2020-11-13 13:16:27 +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 Char/misc driver fixes for 5.10-rc6 2020-11-28 10:04:36 -08:00
Makefile Linux 5.10-rc6 2020-11-29 15:50:50 -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.