APPLIED[J]: [PATCH 0/1][SRU][Jammy] Fix AMD Yellow Carp GPU UBSAN warning array-index-out-of-bounds

[Andrea Righi]

On Wed, Jan 19, 2022 at 03:44:28AM +0800, You-Sheng Yang wrote:
> BugLink: https://bugs.launchpad.net/bugs/1958229
> 
> [Impact]
> 
> On HP Lockheed16, following UBSAN warning dumped at boot and the first
> USB4 port is disabled:
> 
>   UBSAN: array-index-out-of-bounds in /drivers/gpu/drm/amd/amdgpu/../display/dc/dcn31/dcn31_resource.c:1295:22
>   index 6 is out of range for type 'dcn10_stream_enc_registers[5]'
> 
> This is a follow-up for bug 1953008 on Jammy, which only happens when
> patches for USB4 alt mode were applied and tested on a HP platform.
> 
> [Fix]
> 
> Commit d374d3b49321 ("drm/amd/display: Fix out of bounds access on DNC31
> stream encoder regs") from Linus' tree.
> 
> [Test Case]
> 
> Apply and check no more such warning, and USB alt mode should work.
> 
> [Where problems could occur]
> 
> No. This specifies the expected array size to avoid UBSAN warning.
> 
> [Other Info]
> 
> While UBSAN is only turned on by default on 5.15 kernels or newer, and
> we didn't find this issue on oem-5.14, so only Jammy is nominated here.

Applied to jammy/linux, thanks!

-Andrea