drm/amdgpu: Fix runtime PM leak in amdgpu_debugfs_test_ib_show()

Overview

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: Fix runtime PM leak in amdgpu_debugfs_test_ib_show()

amdgpu_debugfs_test_ib_show() resumes the device with pm_runtime_get_sync() before taking the reset domain semaphore with down_write_killable(). If the write lock acquisition is interrupted, the function returns without calling pm_runtime_put_autosuspend(), leaking the runtime PM reference acquired for the device and keeping the GPU awake.

Drop the runtime PM reference on the interrupted down_write_killable() error path before returning.

(cherry picked from commit ec30a576c2d4c0364549e6c04218f50704ef56c8)

Affected

• Linux >= 6049db43d6dd9cbb9d7f897839d15b0bc600e23c < fc5606ac91642d0f184b83ab833148c457c3c331
• Linux >= 6049db43d6dd9cbb9d7f897839d15b0bc600e23c < 2c1a643942caae938ea84df2648a9b0c136e09be
• Linux >= 6049db43d6dd9cbb9d7f897839d15b0bc600e23c < e016347fb1829489e062ea51a98a51f48b1d582d
• Linux >= 6049db43d6dd9cbb9d7f897839d15b0bc600e23c < c28e74395ab09922bbf5be42bc5a6ed1ba4f3c37
• Linux >= 6049db43d6dd9cbb9d7f897839d15b0bc600e23c < 2556dd3a36beb3a11041ef01b5e9762e2157909f
• Linux >= 6049db43d6dd9cbb9d7f897839d15b0bc600e23c < 2b86ab1bd6673c525adda88819d7658ba9e784ec
• Linux 5.10

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.