[asterisk-bugs] [JIRA] (ASTERISK-21395) High CPU use due to invalid time limit passed to kevent() in pbx_spool.c:scanthread

[Stuart Henderson (JIRA)]

Stuart Henderson created ASTERISK-21395:
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             Summary: High CPU use due to invalid time limit passed to kevent() in pbx_spool.c:scanthread
                 Key: ASTERISK-21395
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-21395
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Core/PBX
    Affects Versions: 11.3.0
         Environment: OpenBSD since switching to kernel backed threads (in 5.1)
            Reporter: Stuart Henderson


scan_thread() (pbx_spool.c:754) passes an invalid time limit (INT_MAX) to kevent() if the directory list is empty. This results in high CPU use as the call fails with EINVAL (see line 613 of http://www.openbsd.org/cgi-bin/cvsweb/src/sys/kern/kern_time.c?annotate=1.77) and hits the "continue". So in the case where next == INT_MAX, NULL should be passed instead.

Obvious patch is in OpenBSD ports, I won't submit it here directly as I don't particularly want to sign a license disclaimer, but it wouldn't be a big surprise if anyone looking at this came up with an identical fix ;)

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