CVE-2023-53597

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

cifs: fix mid leak during reconnection after timeout threshold

When the number of responses with status of STATUS_IO_TIMEOUT

exceeds a specified threshold (NUM_STATUS_IO_TIMEOUT), we reconnect

the connection. But we do not return the mid, or the credits

returned for the mid, or reduce the number of in-flight requests.

This bug could result in the server->in_flight count to go bad,

and also cause a leak in the mids.

This change moves the check to a few lines below where the

response is decrypted, even of the response is read from the

transform header. This way, the code for returning the mids

can be reused.

Also, the cifs_reconnect was reconnecting just the transport

connection before. In case of multi-channel, this may not be

what we want to do after several timeouts. Changed that to

reconnect the session and the tree too.

Also renamed NUM_STATUS_IO_TIMEOUT to a more appropriate name

MAX_STATUS_IO_TIMEOUT.