CVE-2024-26846

In the Linux kernel, the following vulnerability has been resolved:
nvme-fc: do not wait in vain when unloading module The module exit path has
race between deleting all controllers and freeing ‘left over IDs’. To
prevent double free a synchronization between nvme_delete_ctrl and
ida_destroy has been added by the initial commit. There is some logic
around trying to prevent from hanging forever in wait_for_completion,
though it does not handling all cases. E.g. blktests is able to reproduce
the situation where the module unload hangs forever. If we completely rely
on the cleanup code executed from the nvme_delete_ctrl path, all IDs will
be freed eventually. This makes calling ida_destroy unnecessary. We only
have to ensure that all nvme_delete_ctrl code has been executed before we
leave nvme_fc_exit_module. This is done by flushing the nvme_delete_wq
workqueue. While at it, remove the unused nvme_fc_wq workqueue too.

Notes