[Bug 209987] New: Memory leak in amdgpu_dm_update_connector_after_detect

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=209987

            Bug ID: 209987
           Summary: Memory leak in amdgpu_dm_update_connector_after_detect
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.9.1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: lstarnes1024 at gmail.com
        Regression: No

Created attachment 293341
  --> https://bugzilla.kernel.org/attachment.cgi?id=293341&action=edit
/sys/kernel/debug/kmemleak

It looks like there's a memory leak in
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c:amdgpu_dm_update_connector_after_detect.
It appears to be calling drm_add_edid_modes, which indirectly calling ito
either do_detailed_mode or drm_mode_duplicate.

This has caused me to run out of memory a handful of times, which could only be
resolved by rebooting.

I only experienced this after upgrading to 5.9.1, and it looks like commit
b24bdc37d03a0478189e20a50286092840f414fa added the call to drm_add_edid_modes
in amdgpu_dm_update_connector_after_detect.

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