CVE-2024-27435

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

nvme: fix reconnection fail due to reserved tag allocation

We found a issue on production environment while using NVMe over RDMA,

admin_q reconnect failed forever while remote target and network is ok.

After dig into it, we found it may caused by a ABBA deadlock due to tag

allocation. In my case, the tag was hold by a keep alive request

waiting inside admin_q, as we quiesced admin_q while reset ctrl, so the

request maked as idle and will not process before reset success. As

fabric_q shares tagset with admin_q, while reconnect remote target, we

need a tag for connect command, but the only one reserved tag was held

by keep alive command which waiting inside admin_q. As a result, we

failed to reconnect admin_q forever. In order to fix this issue, I

think we should keep two reserved tags for admin queue.