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Eugeniu Rosca c92d30e4b7 media: vsp1: dl: Fix NULL pointer dereference on unbind 
In commit f3b98e3c4d ("media: vsp1: Provide support for extended
command pools"), the vsp pointer used for referencing the VSP1 device
structure from a command pool during vsp1_dl_ext_cmd_pool_destroy() was
not populated.

Correctly assign the pointer to prevent the following
null-pointer-dereference when removing the device:

[*] h3ulcb-kf #>
echo fea28000.vsp > /sys/bus/platform/devices/fea28000.vsp/driver/unbind
 Unable to handle kernel NULL pointer dereference at virtual address 0000000000000028
 Mem abort info:
   ESR = 0x96000006
   EC = 0x25: DABT (current EL), IL = 32 bits
   SET = 0, FnV = 0
   EA = 0, S1PTW = 0
 Data abort info:
   ISV = 0, ISS = 0x00000006
   CM = 0, WnR = 0
 user pgtable: 4k pages, 48-bit VAs, pgdp=00000007318be000
 [0000000000000028] pgd=00000007333a1003, pud=00000007333a6003, pmd=0000000000000000
 Internal error: Oops: 96000006 [#1] PREEMPT SMP
 Modules linked in:
 CPU: 1 PID: 486 Comm: sh Not tainted 5.7.0-rc6-arm64-renesas-00118-ge644645abf47 #185
 Hardware name: Renesas H3ULCB Kingfisher board based on r8a77951 (DT)
 pstate: 40000005 (nZcv daif -PAN -UAO)
 pc : vsp1_dlm_destroy+0xe4/0x11c
 lr : vsp1_dlm_destroy+0xc8/0x11c
 sp : ffff800012963b60
 x29: ffff800012963b60 x28: ffff0006f83fc440
 x27: 0000000000000000 x26: ffff0006f5e13e80
 x25: ffff0006f5e13ed0 x24: ffff0006f5e13ed0
 x23: ffff0006f5e13ed0 x22: dead000000000122
 x21: ffff0006f5e3a080 x20: ffff0006f5df2938
 x19: ffff0006f5df2980 x18: 0000000000000003
 x17: 0000000000000000 x16: 0000000000000016
 x15: 0000000000000003 x14: 00000000000393c0
 x13: ffff800011a5ec18 x12: ffff800011d8d000
 x11: ffff0006f83fcc68 x10: ffff800011a53d70
 x9 : ffff8000111f3000 x8 : 0000000000000000
 x7 : 0000000000210d00 x6 : 0000000000000000
 x5 : ffff800010872e60 x4 : 0000000000000004
 x3 : 0000000078068000 x2 : ffff800012781000
 x1 : 0000000000002c00 x0 : 0000000000000000
 Call trace:
  vsp1_dlm_destroy+0xe4/0x11c
  vsp1_wpf_destroy+0x10/0x20
  vsp1_entity_destroy+0x24/0x4c
  vsp1_destroy_entities+0x54/0x130
  vsp1_remove+0x1c/0x40
  platform_drv_remove+0x28/0x50
  __device_release_driver+0x178/0x220
  device_driver_detach+0x44/0xc0
  unbind_store+0xe0/0x104
  drv_attr_store+0x20/0x30
  sysfs_kf_write+0x48/0x70
  kernfs_fop_write+0x148/0x230
  __vfs_write+0x18/0x40
  vfs_write+0xdc/0x1c4
  ksys_write+0x68/0xf0
  __arm64_sys_write+0x18/0x20
  el0_svc_common.constprop.0+0x70/0x170
  do_el0_svc+0x20/0x80
  el0_sync_handler+0x134/0x1b0
  el0_sync+0x140/0x180
 Code: b40000c2 f9403a60 d2800084 a9400663 (f9401400)
 ---[ end trace 3875369841fb288a ]---

Fixes: f3b98e3c4d ("media: vsp1: Provide support for extended command pools")
Cc: stable@vger.kernel.org # v4.19+
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Tested-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
History 2020-07-04 12:02:02 +02:00
arch Kbuild updates for v5.8 (2nd) 2020-06-13 13:29:16 -07:00
block Kbuild updates for v5.8 (2nd) 2020-06-13 13:29:16 -07:00
certs .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
crypto Merge branch 'rwonce/rework' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux 2020-06-10 14:46:54 -07:00
Documentation media: cec-ioc-adap-g-caps.rst: document available_log_addrs 2020-06-23 15:10:51 +02:00
drivers media: vsp1: dl: Fix NULL pointer dereference on unbind 2020-07-04 12:02:02 +02:00
fs for-5.8-part2-tag 2020-06-14 09:47:25 -07:00
include media: media/cec.h: document cec_adapter fields 2020-06-23 15:11:44 +02:00
init Kbuild updates for v5.8 (2nd) 2020-06-13 13:29:16 -07:00
ipc mmap locking API: use coccinelle to convert mmap_sem rwsem call sites 2020-06-09 09:39:14 -07:00
kernel Add additional LSM hooks for SafeSetID 2020-06-14 11:39:31 -07:00
lib Kbuild updates for v5.8 (2nd) 2020-06-13 13:29:16 -07:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm Kbuild updates for v5.8 (2nd) 2020-06-13 13:29:16 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-06-13 16:27:13 -07:00
samples binderfs: add gitignore for generated sample program 2020-06-13 13:41:24 -07:00
scripts Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-06-13 16:27:13 -07:00
security Add additional LSM hooks for SafeSetID 2020-06-14 11:39:31 -07:00
sound Kbuild updates for v5.8 (2nd) 2020-06-13 13:29:16 -07:00
tools Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-06-13 16:27:13 -07:00
usr bpfilter: match bit size of bpfilter_umh to that of the kernel 2020-05-17 18:52:01 +09:00
virt MIPS: 2020-06-12 11:05:52 -07:00
.clang-format block: add bio_for_each_bvec_all() 2020-05-25 11:25:24 +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 modpost: generate vmlinux.symvers and reuse it for the second modpost 2020-06-06 23:38:12 +09:00
.mailmap A fair amount of stuff this time around, dominated by yet another massive 2020-06-01 15:45:27 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS mailmap: change email for Ricardo Ribalda 2020-05-25 18:59:59 -06:00
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 media: MAINTAINERS: rc-core and lirc maintainership 2020-06-23 15:08:14 +02:00
Makefile Linux 5.8-rc1 2020-06-14 12:45:04 -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.