mm/damon/core: fix new damon_target objects leaks on damon_commit_targets()

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

mm/damon/core: fix new damon_target objects leaks on damon_commit_targets()

Patch series "mm/damon/core: fix memory leaks and ignored inputs from

damon_commit_ctx()".

Due to two bugs in damon_commit_targets() and damon_commit_schemes(),

which are called from damon_commit_ctx(), some user inputs can be ignored,

and some mmeory objects can be leaked. Fix those.

Note that only DAMON sysfs interface users are affected. Other DAMON core

API user modules that more focused more on simple and dedicated production

usages, including DAMON_RECLAIM and DAMON_LRU_SORT are not using the buggy

function in the way, so not affected.

This patch (of 2):

When new DAMON targets are added via damon_commit_targets(), the newly

created targets are not deallocated when updating the internal data

(damon_commit_target()) is failed. Worse yet, even if the setup is

successfully done, the new target is not linked to the context. Hence,

the new targets are always leaked regardless of the internal data setup

failure. Fix the leaks.