[HIGH] STR #4192: CUPS daemon crashes on bad entry in cupsd.conf

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[STR New]

Original bug report in Ubuntu:

https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1036974

When updating Ubuntu to the current development version CUPS got updated
from 1.5.3 to 1.6.1. Many users have the obsolete keywords BrowsePoll,
BrowseAllow, BrowseDeny, BrowseOrder, and BrowseRemoteProtocols or the
obsolete argument "cups" for the still valid BrowseLocalProtocols keyword
in their cupsd.conf.

At least the obsolete (or perhaps any invalid/mistyped) keywords cause the
CUPS daemon to crash. What I expect is that simply an error gets reported
in error_log.

Stack traces of the crash are attached to the Ubuntu bug report:

https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1036974/+attachment/3261809/+files/Stacktrace.txt
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1036974/+attachment/3261811/+files/ThreadStacktrace.txt

Link: http://www.cups.org/str.php?L4192
Version: 1.6.1