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From: bugzilla-daemon@ecoscentric.com
To: ecos-bugs@ecos.sourceware.org
Subject: [Bug 1000772] New: SNMP lockup on requests for ifTable interface
 number <= 0
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X-Bugzilla-Product: eCos
X-Bugzilla-Component: SNMP
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X-Bugzilla-Who: grant.b.edwards@gmail.com
X-Bugzilla-Status: UNCONFIRMED
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Message-ID: <bug-1000772-13@http.bugs.ecos.sourceware.org/>
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Date: Mon, 18 May 2009 18:04:00 -0000
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http://bugs.ecos.sourceware.org/show_bug.cgi?id=1000772

           Summary: SNMP lockup on requests for ifTable interface number <=
                    0
           Product: eCos
           Version: CVS
          Platform: Other (please specify)
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: normal
         Component: SNMP
        AssignedTo: bartv@ecoscentric.com
        ReportedBy: grant.b.edwards@gmail.com
         QAContact: ecos-bugs@ecos.sourceware.org
             Class: ---


Created an attachment (id=728)
 --> (http://bugs.ecos.sourceware.org/attachment.cgi?id=728)
Patch to fix SNMP lock-up

The FreeBSD SNMP helper cyg_snmp_get_if() exhibits a bug when
passed if_num<=0: it loops 2^32 times -- walking through all of
memory and then returning a rogue pointer.

This can be demonstrated by sending an eCos-based device an SMP
"get" request for OID 1.3.6.1.2.1.2.2.1.6.0.  Typical behavior
is that the device will lock up for several seconds ans the
SNMP management thread loops through all of memory.

The problem didn't exist in the helper routine for the NetBSD.

The attached patch fixes the problem.


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