ACK: [SRU][J][PATCH 0/1] CVE-2024-26661

[Thibault Ferrante]

Acked-by: Thibault Ferrante <thibault.ferrante at canonical.com>


On 05-09-2024 02:52, Hui Wang wrote:
> [Impact]
> 
> In "u32 otg_inst = pipe_ctx->stream_res.tg->inst;", the
> pipe_ctx->stream_res.tg could be NULL in some cases.
> 
> [Backport]
> 
> To cleanly cherry-pick the patch to jammy kernel, at least 2
> prerequisite patches are needed, they are 6f0ef80a00ad ("
> drm/amd/display: Fix ABM pipe/backlight issues when change backlight")
> and 0210dcf253d8 ("drm/amd/display: Pass pwrseq inst for backlight
> and ABM"), each of them will introduce significant change and most of
> change is not relevant to this CVE issue.
>  From the commit header, the patch is to resolve the possible NULL ptr
> issue of pipe_ctx->stream_res.tg, hence I just backport the relevant
> part and drop the conflict part. This backported patch could resolve
> the possible NULL issue and keep the other part unchanged.
> 
> [Fix]
> 
> Noble:  Fixed
> Jammy:  Backported from mainline linux-v6.8-rc4 to jammy, see explanation in [Backport]
> Focal:  Not affected
> Bionic: Not affected
> Xenial: Not affected
> 
> [Test Case]
> 
> Building test passed.
> 
> And Tested the patched kernel on a Lenovo laptop with AMD cpu, the
> graphic worked as well as before, the system could boot to Desktop,
> I could ran applications under Desktop.
> 
> [Where problems could occur]
> 
> The change impacts amdgpu driver, if there is regression, it will be
> in the graphic, something like abnormal situation on graphic. But the
> likely of regression is very low, the change is straightforward and
> simple, and I tested the patched kernel on an AMD laptop, everything
> worked well.
> 
> Srinivasan Shanmugam (1):
>    drm/amd/display: Add NULL test for 'timing generator' in
>      'dcn21_set_pipe()'
> 
>   drivers/gpu/drm/amd/display/dc/dcn21/dcn21_hwseq.c | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 


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Thibault