Public bug reported:
SRU Justification
[Impact]
Out of order reads can fetch a NULL pointer causing a kernel crash.
Affects kernels from v4.15 to v5.11.
[Fix]
commit 84a24bf8c52e66b7ac89ada5e3cfbe72d65c1896 ("locking/qrwlock: Fix
ordering in queued_write_lock_slowpath()")
[Where problems could occur]
This is quite a subtle bug. It is more prevalent on arm64. Regression
possibility seems quite low. The worst impact could be a minor performance
degradation.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1926184
Title:
locking/qrwlock: Fix ordering in queued_write_lock_slowpath()
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