net-snmp/SOURCES/net-snmp-5.8-fix-cert-crash.patch

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2021-11-09 10:08:22 +00:00
diff -urNp a/snmplib/snmp_openssl.c b/snmplib/snmp_openssl.c
--- a/snmplib/snmp_openssl.c 2021-06-09 12:38:23.196037329 +0200
+++ b/snmplib/snmp_openssl.c 2021-06-09 12:44:11.782503048 +0200
@@ -284,31 +284,30 @@ _cert_get_extension(X509_EXTENSION *oex
}
if (X509V3_EXT_print(bio, oext, 0, 0) != 1) {
snmp_log(LOG_ERR, "could not print extension!\n");
- BIO_vfree(bio);
- return NULL;
+ goto out;
}
space = BIO_get_mem_data(bio, &data);
if (buf && *buf) {
- if (*len < space)
- buf_ptr = NULL;
- else
- buf_ptr = *buf;
+ if (*len < space +1) {
+ snmp_log(LOG_ERR, "not enough buffer space to print extension\n");
+ goto out;
+ }
+ buf_ptr = *buf;
+ } else {
+ buf_ptr = calloc(1, space + 1);
}
- else
- buf_ptr = calloc(1,space + 1);
if (!buf_ptr) {
- snmp_log(LOG_ERR,
- "not enough space or error in allocation for extenstion\n");
- BIO_vfree(bio);
- return NULL;
+ snmp_log(LOG_ERR, "error in allocation for extenstion\n");
+ goto out;
}
memcpy(buf_ptr, data, space);
buf_ptr[space] = 0;
if (len)
*len = space;
+out:
BIO_vfree(bio);
return buf_ptr;
@@ -479,7 +478,7 @@ netsnmp_openssl_cert_dump_extensions(X50
{
X509_EXTENSION *extension;
const char *extension_name;
- char buf[SNMP_MAXBUF_SMALL], *buf_ptr = buf, *str, *lf;
+ char buf[SNMP_MAXBUF], *buf_ptr = buf, *str, *lf;
int i, num_extensions, buf_len, nid;
if (NULL == ocert)
@@ -499,6 +498,11 @@ netsnmp_openssl_cert_dump_extensions(X50
extension_name = OBJ_nid2sn(nid);
buf_len = sizeof(buf);
str = _cert_get_extension_str_at(ocert, i, &buf_ptr, &buf_len, 0);
+ if (!str) {
+ DEBUGMSGT(("9:cert:dump", " %2d: %s\n", i,
+ extension_name));
+ continue;
+ }
lf = strchr(str, '\n'); /* look for multiline strings */
if (NULL != lf)
*lf = '\0'; /* only log first line of multiline here */