In the Linux kernel, the following vulnerability has been resolved: net/sched: actapi: avoid dereferencing ERRPTR in tcfidrinfodestroy syzbot reported a crash in tcactinhw() during netns teardown where tcfidrinfodestroy() passed an ERRPTR(-EBUSY) value as a tcaction pointer, leading to an invalid dereference. Guard against ERRPTR entries when iterating the action IDR so teardown does not call tcactin_hw() on an error pointer.