Vulnerability CVE-2023-52498
Published: 2024-03-11

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

PM: sleep: Fix possible deadlocks in core system-wide PM code

It is reported that in low-memory situations the system-wide resume core
code deadlocks, because async_schedule_dev() executes its argument
function synchronously if it cannot allocate memory (and not only in
that case) and that function attempts to acquire a mutex that is already
held. Executing the argument function synchronously from within
dpm_async_fn() may also be problematic for ordering reasons (it may
cause a consumer device's resume callback to be invoked before a
requisite supplier device's one, for example).

Address this by changing the code in question to use
async_schedule_dev_nocall() for scheduling the asynchronous
execution of device suspend and resume functions and to directly
run them synchronously if async_schedule_dev_nocall() returns false.

 References:
https://git.kernel.org/stable/c/f46eb832389f162ad13cb780d0b8cde93641990d
https://git.kernel.org/stable/c/a1d62c775b07213c73f81ae842424c74dd14b5f0
https://git.kernel.org/stable/c/e1c9d32c98309ae764893a481552d3f99d46cb34
https://git.kernel.org/stable/c/e681e29d1f59a04ef773296e4bebb17b1b79f8fe
https://git.kernel.org/stable/c/9bd3dce27b01c51295b60e1433e1dadfb16649f7
https://git.kernel.org/stable/c/7839d0078e0d5e6cc2fa0b0dfbee71de74f1e557
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