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Sudeep Holla ad73dc7263 firmware: arm_ffa: Check if ffa_driver remove is present before executing commit `b71b55248a` upstream. Currently ffa_drv->remove() is called unconditionally from ffa_device_remove(). Since the driver registration doesn't check for it and allows it to be registered without .remove callback, we need to check for the presence of it before executing it from ffa_device_remove() to above a NULL pointer dereference like the one below: \| Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 \| Mem abort info: \| ESR = 0x0000000086000004 \| EC = 0x21: IABT (current EL), IL = 32 bits \| SET = 0, FnV = 0 \| EA = 0, S1PTW = 0 \| FSC = 0x04: level 0 translation fault \| user pgtable: 4k pages, 48-bit VAs, pgdp=0000000881cc8000 \| [0000000000000000] pgd=0000000000000000, p4d=0000000000000000 \| Internal error: Oops: 0000000086000004 [#1] PREEMPT SMP \| CPU: 3 PID: 130 Comm: rmmod Not tainted 6.3.0-rc7 #6 \| Hardware name: FVP Base RevC (DT) \| pstate: 63402809 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=-c) \| pc : 0x0 \| lr : ffa_device_remove+0x20/0x2c \| Call trace: \| 0x0 \| device_release_driver_internal+0x16c/0x260 \| driver_detach+0x90/0xd0 \| bus_remove_driver+0xdc/0x11c \| driver_unregister+0x30/0x54 \| ffa_driver_unregister+0x14/0x20 \| cleanup_module+0x18/0xeec \| __arm64_sys_delete_module+0x234/0x378 \| invoke_syscall+0x40/0x108 \| el0_svc_common+0xb4/0xf0 \| do_el0_svc+0x30/0xa4 \| el0_svc+0x2c/0x7c \| el0t_64_sync_handler+0x84/0xf0 \| el0t_64_sync+0x190/0x194 Fixes: `244f5d597e` ("firmware: arm_ffa: Add missing remove callback to ffa_bus_type") Link: https://lore.kernel.org/r/20230419-ffa_fixes_6-4-v2-1-d9108e43a176@arm.com Signed-off-by: Sudeep Holla <sudeep.holla@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2023-05-30 14:03:22 +01:00
arch	x86/topology: Fix erroneous smp_num_siblings on Intel Hybrid platforms	2023-05-30 14:03:19 +01:00
block	block, bfq: Fix division by zero error on zero wsum	2023-05-24 17:32:38 +01:00
certs	certs: Fix build error when PKCS#11 URI contains semicolon	2023-02-09 11:28:11 +01:00
crypto	crypto: testmgr - fix RNG performance in fuzz tests	2023-05-24 17:32:53 +01:00
Documentation	dt-binding: cdns,usb3: Fix cdns,on-chip-buff-size type	2023-05-30 14:03:19 +01:00
drivers	firmware: arm_ffa: Check if ffa_driver remove is present before executing	2023-05-30 14:03:22 +01:00
fs	cifs: mapchars mount option ignored	2023-05-30 14:03:21 +01:00
include	power: supply: bq27xxx: Ensure power_supply_changed() is called on current sign changes	2023-05-30 14:03:21 +01:00
init	gcc: disable '-Warray-bounds' for gcc-13 too	2023-04-26 14:28:43 +02:00
io_uring	io_uring/rsrc: use nospec'ed indexes	2023-05-11 23:03:24 +09:00
ipc	ipc: fix memory leak in init_mqueue_fs()	2022-12-31 13:32:01 +01:00
kernel	bpf: fix a memory leak in the LRU and LRU_PERCPU hash maps	2023-05-30 14:03:21 +01:00
lib	debugobjects: Don't wake up kswapd from fill_pool()	2023-05-30 14:03:20 +01:00
LICENSES	LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers	2021-12-16 14:33:10 +01:00
mm	mm: fix zswap writeback race condition	2023-05-24 17:32:51 +01:00
net	ipv6: Fix out-of-bounds access in ipv6_find_tlv()	2023-05-30 14:03:21 +01:00
rust	rust: kernel: Mark rust_fmt_argument as extern "C"	2023-04-26 14:28:38 +02:00
samples	samples/bpf: Fix fout leak in hbm's run_bpf_prog	2023-05-24 17:32:38 +01:00
scripts	recordmcount: Fix memory leaks in the uwrite function	2023-05-24 17:32:41 +01:00
security	selinux: ensure av_permissions.h is built when needed	2023-05-11 23:03:06 +09:00
sound	ASoC: lpass: Fix for KASAN use_after_free out of bounds	2023-05-30 14:03:20 +01:00
tools	selftests: fib_tests: mute cleanup error message	2023-05-30 14:03:20 +01:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	KVM: Fix vcpu_array[0] races	2023-05-24 17:32:50 +01:00
.clang-format	inet: ping: use hlist_nulls rcu iterator during lookup	2022-12-01 12:42:46 +01:00
.cocciconfig	scripts: add Linux .cocciconfig for coccinelle	2016-07-22 12:13:39 +02:00
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	Kbuild: add Rust support	2022-09-28 09:02:20 +02:00
.mailmap	9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address	2022-12-10 17:10:52 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Remove Michal Marek from Kbuild maintainers	2022-11-16 14:53:00 +09:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	platform/x86: Move existing HP drivers to a new hp subdir	2023-05-24 17:32:42 +01:00
Makefile	Linux 6.1.30	2023-05-24 17:32:53 +01:00
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.