From: Boris Lytochkin <lytboris@php.net>
Date: Sat, 5 Feb 2011 13:22:38 +0000 (+0000)
Subject: fix crash caused by incorrect offset altering
X-Git-Tag: php-5.4.0alpha1~191^2~261
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=c50b3d7addb1fbf8af0e0ed6b075c7c5503cd927;p=php

fix crash caused by incorrect offset altering
---

diff --git a/ext/snmp/snmp.c b/ext/snmp/snmp.c
index ad38e415a7..46337ceb5d 100644
--- a/ext/snmp/snmp.c
+++ b/ext/snmp/snmp.c
@@ -843,7 +843,7 @@ retry:
 						vars = vars->next_variable, count++);
 
 					if (st & (SNMP_CMD_GET | SNMP_CMD_GETNEXT) && response->errstat == SNMP_ERR_TOOBIG && objid_set->step > 1) { /* Answer will not fit into single packet */
-						objid_set->offset -= objid_set->step;
+						objid_set->offset = ((objid_set->offset > objid_set->step) ? (objid_set->offset - objid_set->step) : 0 );
 						objid_set->step /= 2;
 						snmp_free_pdu(response);
 						keepwalking = 1;