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Guenter Roeck faf4d8e07f drm/amd/display: fix array-bounds error in dc_stream_remove_writeback() [take 2] 
Commit 5d8c3e836f ("drm/amd/display: fix array-bounds error in
dc_stream_remove_writeback()") tried to fix an array bounds error seen
with gcc 12.0. Unfortunately, that results in another array bounds error,
seen with older versions of gcc.

Building csky:allmodconfig ... failed
--------------
Error log:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:
	In function 'dc_stream_remove_writeback':
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:527:83:
	error: array subscript 1 is above array bounds of 'struct dc_writeback_info[1]' [-Werror=array-bounds]
  527 |                                 stream->writeback_info[j] = stream->writeback_info[i];
      |                                                             ~~~~~~~~~~~~~~~~~~~~~~^~~
In file included from drivers/gpu/drm/amd/amdgpu/../display/dc/dc.h:1269,
                 from drivers/gpu/drm/amd/amdgpu/../display/dc/inc/core_types.h:29,
                 from drivers/gpu/drm/amd/amdgpu/../display/dc/basics/dc_common.h:29,
                 from drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_stream.c:27:
drivers/gpu/drm/amd/amdgpu/../display/dc/dc_stream.h:241:34: note: while referencing 'writeback_info'
  241 |         struct dc_writeback_info writeback_info[MAX_DWB_PIPES];

We could check both i and j for overflow to fix the problem. That would,
however, be not make much sense since it is known and provable that j <= i.
Also, the check introduced with commit 5d8c3e836f does not really add
value since it checks if j < MAX_DWB_PIPES. Since it is known that j <= i,
it would make more sense to check if i < MAX_DWB_PIPES. Unfortunately, that
does not help to solve the problem observed here: gcc still complains.

To solve the problem, replace the subsequent check for 'i != j' with
'j < i'. This is identical to the original check since we know that j <= i,
and it makes all versions of gcc happy. Drop the check introduced with
commit 5d8c3e836f since it is not really useful and does not solve the
problem.

Cc: Aurabindo Pillai <aurabindo.pillai@amd.com>
Cc: Hamza Mahfooz <hamza.mahfooz@amd.com>
Fixes: 5d8c3e836f ("drm/amd/display: fix array-bounds error in dc_stream_remove_writeback()")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
 		2022-10-10 17:32:56 -04:00
Documentation drm-misc-next for v6.1: 2022-10-04 09:29:25 +10:00
LICENSES
…
arch Misc irqchip fixes: LoongArch driver fixes and a Hyper-V IOMMU fix. 2022-08-21 15:09:55 -07:00
block block-6.0-2022-08-19 2022-08-20 10:17:05 -07:00
certs Kbuild updates for v5.20 2022-08-10 10:40:41 -07:00
crypto crypto: blake2b: effectively disable frame size warning 2022-08-10 17:59:11 -07:00
drivers drm/amd/display: fix array-bounds error in dc_stream_remove_writeback() [take 2] 2022-10-10 17:32:56 -04:00
fs 5 cifs/smb3 fixes, one for stable 2022-08-21 10:21:16 -07:00
include Merge tag 'amd-drm-next-6.1-2022-09-23' of https://gitlab.freedesktop.org/agd5f/linux into drm-next 2022-09-28 14:56:09 +10:00
init asm goto: eradicate CC_HAS_ASM_GOTO 2022-08-21 10:06:28 -07:00
io_uring io_uring/net: use right helpers for async_data 2022-08-18 07:27:20 -06:00
ipc Updates to various subsystems which I help look after. lib, ocfs2, 2022-08-07 10:03:24 -07:00
kernel Various fixes for tracing: 2022-08-21 14:49:42 -07:00
lib lib/cpumask: drop always-true preprocessor guard 2022-08-15 11:00:44 -07:00
mm - hugetlb_vmemmap cleanups from Muchun Song 2022-08-10 11:18:00 -07:00
net tcp: handle pure FIN case correctly 2022-08-18 11:04:56 -07:00
samples Tracing updates for 5.20 / 6.0 2022-08-05 09:41:12 -07:00
scripts asm goto: eradicate CC_HAS_ASM_GOTO 2022-08-21 10:06:28 -07:00
security hardening fixes for v6.0-rc2 2022-08-19 13:56:14 -07:00
sound sound fixes for 6.0-rc2 2022-08-19 09:46:11 -07:00
tools asm goto: eradicate CC_HAS_ASM_GOTO 2022-08-21 10:06:28 -07:00
usr
…
virt KVM: Drop unnecessary initialization of "ops" in kvm_ioctl_create_device() 2022-08-19 04:05:43 -04:00
.clang-format
…
.cocciconfig
…
.get_maintainer.ignore
…
.gitattributes
…
.gitignore
…
.mailmap Updates to various subsystems which I help look after. lib, ocfs2, 2022-08-07 10:03:24 -07:00
COPYING
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CREDITS drm for 5.20/6.0 2022-08-03 19:52:08 -07:00
Kbuild
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Kconfig
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MAINTAINERS Immutable backlight-detect-refactor branch between acpi, drm-* and pdx86 2022-09-14 12:27:10 +01:00
Makefile Linux 6.0-rc2 2022-08-21 17:32:54 -07:00
README
…

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.