Bug 2367577 (CVE-2025-37965)

Summary: CVE-2025-37965 kernel: drm/amd/display: Fix invalid context error in dml helper
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-05-20 17:01:43 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Fix invalid context error in dml helper

[Why]
"BUG: sleeping function called from invalid context" error.
after:
"drm/amd/display: Protect FPU in dml2_validate()/dml21_validate()"

The populate_dml_plane_cfg_from_plane_state() uses the GFP_KERNEL flag
for memory allocation, which shouldn't be used in atomic contexts.

The allocation is needed only for using another helper function
get_scaler_data_for_plane().

[How]
Modify helpers to pass a pointer to scaler_data within existing context,
eliminating the need for dynamic memory allocation/deallocation
and copying.

(cherry picked from commit bd3e84bc98f81b44f2c43936bdadc3241d654259)
Comment 1 Avinash Hanwate 2025-05-21 06:41:35 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025052043-CVE-2025-37965-5602@gregkh/T