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Change History

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

mm/damon/sysfs: dealloc repeat_call_control if damon_call() fails

damon_call() for repeat_call_control of DAMON_SYSFS could fail if somehow
the kdamond is stopped before the damon_call().  It could happen, for
example, when te damon context was made for monitroing of a virtual
address processes, and the process is terminated immediately, before the
damon_call() invocation.  In the case, the dyanmically allocated
repeat_call_control is not deallocated and leaked.

Fix the leak by deallocating the repeat_call_control under the
damon_call() failure.

This issue is discovered by sashiko [1].

https://git.kernel.org/stable/c/0199390a6b92fc21860e1b858abf525c7e73b956

https://git.kernel.org/stable/c/0655f5cf1735508394ef8af98ddcfab3ac1c1cc5

https://git.kernel.org/stable/c/b9dadf026a9fb681ed32a0646adc10ab485bf3b1