Author: ngie
Date: Sat Dec 31 22:46:17 2016
New Revision: 310987
URL: https://svnweb.freebsd.org/changeset/base/310987
Log:
snmp_output_err_resp, snmp_output_resp: allocate `object` using calloc, not
on the stack
Some of the callers try to determine whether or not `object` is valid by
testing the value for NULL, which will never be true if it's a stack value,
so in order to be clear and correct down the call stack, use a heap
allocated object.
This also addresses a Coverity issue by initializing all of `object` via
calloc
MFC after: 1 week
Reported by: Coverity
CID: 1006392
Modified:
head/usr.sbin/bsnmpd/tools/libbsnmptools/bsnmptools.c
Modified: head/usr.sbin/bsnmpd/tools/libbsnmptools/bsnmptools.c
==============================================================================
--- head/usr.sbin/bsnmpd/tools/libbsnmptools/bsnmptools.c Sat Dec 31
22:18:33 2016 (r310986)
+++ head/usr.sbin/bsnmpd/tools/libbsnmptools/bsnmptools.c Sat Dec 31
22:46:17 2016 (r310987)
@@ -2003,20 +2003,25 @@ snmp_output_object(struct snmp_toolinfo
void
snmp_output_err_resp(struct snmp_toolinfo *snmptoolctx, struct snmp_pdu *pdu)
{
+ struct snmp_object *object;
char buf[ASN_OIDSTRLEN];
- struct snmp_object object;
if (pdu == NULL || (pdu->error_index > (int32_t) pdu->nbindings)) {
- fprintf(stdout,"Invalid error index in PDU\n");
+ fprintf(stdout, "Invalid error index in PDU\n");
+ return;
+ }
+
+ if ((object = calloc(1, sizeof(struct snmp_object))) != NULL) {
+ fprintf(stdout, "calloc: %s", strerror(errno));
return;
}
fprintf(stdout, "Agent %s:%s returned error \n", snmp_client.chost,
snmp_client.cport);
- if (!ISSET_NUMERIC(snmptoolctx) && (snmp_fill_object(snmptoolctx,
&object,
+ if (!ISSET_NUMERIC(snmptoolctx) && (snmp_fill_object(snmptoolctx,
object,
&(pdu->bindings[pdu->error_index - 1])) > 0))
- snmp_output_object(snmptoolctx, &object);
+ snmp_output_object(snmptoolctx, object);
else {
asn_oid2str_r(&(pdu->bindings[pdu->error_index - 1].var), buf);
fprintf(stdout,"%s", buf);
@@ -2028,17 +2033,23 @@ snmp_output_err_resp(struct snmp_toolinf
fprintf(stdout, "%s\n", error_strings[pdu->error_status].str);
else
fprintf(stdout,"%s\n", error_strings[SNMP_ERR_UNKNOWN].str);
+
+ free(object);
+ object = NULL;
}
int32_t
snmp_output_resp(struct snmp_toolinfo *snmptoolctx, struct snmp_pdu *pdu,
struct asn_oid *root)
{
- struct snmp_object object;
+ struct snmp_object *object;
char p[ASN_OIDSTRLEN];
int32_t error;
uint32_t i;
+ if ((object = calloc(1, sizeof(struct snmp_object))) == NULL)
+ return (-1);
+
i = error = 0;
while (i < pdu->nbindings) {
if (root != NULL && !(asn_is_suboid(root,
@@ -2047,18 +2058,22 @@ snmp_output_resp(struct snmp_toolinfo *s
if (GET_OUTPUT(snmptoolctx) != OUTPUT_QUIET) {
if (!ISSET_NUMERIC(snmptoolctx) &&
- (snmp_fill_object(snmptoolctx, &object,
+ (snmp_fill_object(snmptoolctx, object,
&(pdu->bindings[i])) > 0))
- snmp_output_object(snmptoolctx, &object);
+ snmp_output_object(snmptoolctx, object);
else {
asn_oid2str_r(&(pdu->bindings[i].var), p);
fprintf(stdout, "%s", p);
}
}
- error |= snmp_output_numval(snmptoolctx, &(pdu->bindings[i]),
object.info);
+ error |= snmp_output_numval(snmptoolctx, &(pdu->bindings[i]),
+ object->info);
i++;
}
+ free(object);
+ object = NULL;
+
if (error)
return (-1);
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