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cam(4): preserve alloc_flags when copying CCBs
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Authored by trasz on Jul 5 2021, 1:58 PM.

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Summary

Before UMA CCBs, all CCBs were of the same size, and could
be trivially copied using bcopy(9). Now we have to preserve
alloc_flags, otherwise we might end up attempting to free
stack-allocated CCB to UMA; we also need to take CCB size
into account.

This fixes kernel panic which would occur when trying to access
a stopped (as in, SCSI START STOP, also "ctladm stop") SCSI device.

Reported By: Gary Jennejohn <gljennjohn@gmail.com>
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.

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