CVE-2021-47183

In the Linux kernel, the following vulnerability has been resolved: scsi:
lpfc: Fix link down processing to address NULL pointer dereference If an FC
link down transition while PLOGIs are outstanding to fabric well known
addresses, outstanding ABTS requests may result in a NULL pointer
dereference. Driver unload requests may hang with repeated “2878” log
messages. The Link down processing results in ABTS requests for outstanding
ELS requests. The Abort WQEs are sent for the ELSs before the driver had
set the link state to down. Thus the driver is sending the Abort with the
expectation that an ABTS will be sent on the wire. The Abort request is
stalled waiting for the link to come up. In some conditions the driver may
auto-complete the ELSs thus if the link does come up, the Abort completions
may reference an invalid structure. Fix by ensuring that Abort set the flag
to avoid link traffic if issued due to conditions where the link failed.