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

[You-Sheng Yang]

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.

Nicholas Kazlauskas (1):
  drm/amd/display: Fix out of bounds access on DNC31 stream encoder regs

 drivers/gpu/drm/amd/display/dc/dcn31/dcn31_resource.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

-- 
2.33.1