CVE-2022-49535

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

scsi: lpfc: Fix null pointer dereference after failing to issue FLOGI and PLOGI

If lpfc_issue_els_flogi() fails and returns non-zero status, the node

reference count is decremented to trigger the release of the nodelist

structure. However, if there is a prior registration or dev-loss-evt work

pending, the node may be released prematurely. When dev-loss-evt

completes, the released node is referenced causing a use-after-free null

pointer dereference.

Similarly, when processing non-zero ELS PLOGI completion status in

lpfc_cmpl_els_plogi(), the ndlp flags are checked for a transport

registration before triggering node removal. If dev-loss-evt work is

pending, the node may be released prematurely and a subsequent call to

lpfc_dev_loss_tmo_handler() results in a use after free ndlp dereference.

Add test for pending dev-loss before decrementing the node reference count

for FLOGI, PLOGI, PRLI, and ADISC handling.