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Hans de Goede 2090efd157 media: atomisp: revert "don't pass a pointer to a local variable" 
[ Upstream commit a3b36a8ce3 ]

The gcc is warning about returning a pointer to a local variable
is a false positive.

The type of handle is "struct ia_css_rmgr_vbuf_handle **" and
"h.vptr" is left to NULL, so the "if ((*handle)->vptr == 0x0)"
check always succeeds when the "*handle = &h;" statement which
gcc warns about executes. Leading to this statement being executed:

	rmgr_pop_handle(pool, handle);

If that succeeds,  then *handle has been set to point to one of
the pre-allocated array of handles, so it no longer points to h.

If that fails the following statement will be executed:

	/* Note that handle will change to an internally maintained one */
	ia_css_rmgr_refcount_retain_vbuf(handle);

Which allocated a new handle from the array of pre-allocated handles
and then makes *handle point to this. So the address of h is actually
never returned.

The fix for the false-postive compiler warning actually breaks the code,
the new:

	**handle = h;

is part of a "if (pool->copy_on_write) { ... }" which means that the
handle where *handle points to should be treated read-only, IOW
**handle must never be set, instead *handle must be set to point to
a new handle (with a copy of the contents of the old handle).

The old code correctly did this and the new fixed code gets this wrong.

Note there is another patch in this series, which fixes the warning
in another way.

Link: https://lore.kernel.org/linux-media/20220612160556.108264-2-hdegoede@redhat.com
Fixes: fa1451374e ("media: atomisp: don't pass a pointer to a local variable")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2022-08-17 15:14:43 +02:00
arch crypto: arm64/gcm - Select AEAD for GHASH_ARM64_CE 2022-08-17 15:14:38 +02:00
block blk-mq: don't create hctx debugfs dir until q->debugfs_dir is created 2022-08-17 15:14:16 +02:00
certs certs: make system keyring depend on x509 parser 2022-07-24 12:53:55 -07:00
crypto crypto: s390 - do not depend on CRYPTO_HW for SIMD implementations 2022-07-06 20:04:06 -07:00
Documentation dt-bindings: display: bridge: ldb: Fill in reg property 2022-08-17 15:14:22 +02:00
drivers media: atomisp: revert "don't pass a pointer to a local variable" 2022-08-17 15:14:43 +02:00
fs erofs: update ctx->pos for every emitted dirent 2022-08-17 15:14:21 +02:00
include net: sched: provide shim definitions for taprio_offload_{get,free} 2022-08-17 15:14:41 +02:00
init stack: Declare {randomize_,}kstack_offset to fix Sparse warnings 2022-08-17 15:14:14 +02:00
io_uring io_uring: Don't require reinitable percpu_ref 2022-08-17 15:14:20 +02:00
ipc ipc: Free mq_sysctls if ipc namespace creation failed 2022-06-22 17:47:41 -05:00
kernel rcutorture: Fix ksoftirqd boosting timing and iteration 2022-08-17 15:14:33 +02:00
lib test_bpf: fix incorrect netdev features 2022-08-17 15:14:33 +02:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm: Account dirty folios properly during splits 2022-08-17 15:14:38 +02:00
net wifi: mac80211: set STA deflink addresses 2022-08-17 15:14:32 +02:00
samples sample: bpf: xdp_router_ipv4: Allow the kernel to send arp requests 2022-08-17 15:14:25 +02:00
scripts scripts/gdb: Fix gdb 'lx-symbols' command 2022-07-21 10:40:55 -07:00
security selinux: Add boundary check in put_entry() 2022-08-17 15:14:06 +02:00
sound ALSA: hda/realtek: Add a quirk for HP OMEN 15 (8786) mute LED 2022-08-17 15:13:46 +02:00
tools libbpf, riscv: Use a0 for RC register 2022-08-17 15:14:42 +02:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt KVM: Do not incorporate page offset into gfn=>pfn cache user address 2022-08-17 15:13:43 +02:00
.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 ARM: SoC fixes for 5.19, part 4 2022-07-27 09:43:07 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: mark ARM/PALM TREO SUPPORT orphan 2022-07-07 15:17:00 +02:00
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 io_uring: move to separate directory 2022-08-17 15:14:20 +02:00
Makefile io_uring: move to separate directory 2022-08-17 15:14:20 +02:00
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.