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

fs: sysfs: Fix reference leak in sysfs_break_active_protection()

The sysfs_break_active_protection() routine has an obvious reference
leak in its error path.  If the call to kernfs_find_and_get() fails then
kn will be NULL, so the companion sysfs_unbreak_active_protection()
routine won't get called (and would only cause an access violation by
trying to dereference kn->parent if it was called).  As a result, the
reference to kobj acquired at the start of the function will never be
released.

Fix the leak by adding an explicit kobject_put() call when kn is NULL.

kernel.org https://git.kernel.org/stable/c/43f00210cb257bcb0387e8caeb4b46375d67f30c [No types assigned]

kernel.org https://git.kernel.org/stable/c/5d43e072285e81b0b63cee7189b3357c7768a43b [No types assigned]

kernel.org https://git.kernel.org/stable/c/a4c99b57d43bab45225ba92d574a8683f9edc8e4 [No types assigned]

kernel.org https://git.kernel.org/stable/c/a90bca2228c0646fc29a72689d308e5fe03e6d78 [No types assigned]

kernel.org https://git.kernel.org/stable/c/ac107356aabc362aaeb77463e814fc067a5d3957 [No types assigned]