From: Sebastian Krahmer <krahmer@suse.com>
Date: Mon, 15 Sep 2014 05:01:15 +0000 (-0600)
Subject: Fix off by one in SNMP subsystem
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a0d34d0f4c19855aa42a68bf03997de44299eb65;p=thirdparty%2Fsquid.git

Fix off by one in SNMP subsystem
---

diff --git a/src/snmp_core.cc b/src/snmp_core.cc
index b491342073..e081d55cfe 100644
--- a/src/snmp_core.cc
+++ b/src/snmp_core.cc
@@ -418,7 +418,7 @@ snmpConnectionClose(void)
 void
 snmpHandleUdp(int sock, void *not_used)
 {
-    LOCAL_ARRAY(char, buf, SNMP_REQUEST_SIZE);
+    static char buf[SNMP_REQUEST_SIZE];
     IpAddress from;
     snmp_request_t *snmp_rq;
     int len;
@@ -427,16 +427,11 @@ snmpHandleUdp(int sock, void *not_used)
 
     commSetSelect(sock, COMM_SELECT_READ, snmpHandleUdp, NULL, 0);
 
-    memset(buf, '\0', SNMP_REQUEST_SIZE);
+    memset(buf, '\0', sizeof(buf));
 
-    len = comm_udp_recvfrom(sock,
-                            buf,
-                            SNMP_REQUEST_SIZE,
-                            0,
-                            from);
+    len = comm_udp_recvfrom(sock, buf, sizeof(buf)-1, 0, from);
 
     if (len > 0) {
-        buf[len] = '\0';
         debugs(49, 3, "snmpHandleUdp: FD " << sock << ": received " << len << " bytes from " << from << ".");
 
         snmp_rq = (snmp_request_t *)xcalloc(1, sizeof(snmp_request_t));