1 files changed, 19 insertions, 4 deletions

diff --git a/openbsd-compat/getrrsetbyname.c b/openbsd-compat/getrrsetbyname.c
index bea6aea3b..07231d005 100644
--- a/openbsd-compat/getrrsetbyname.c
+++ b/openbsd-compat/getrrsetbyname.c
@@ -49,6 +49,12 @@
 
 #ifndef HAVE_GETRRSETBYNAME
 
+#include <stdlib.h>
+#include <string.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
 #include "getrrsetbyname.h"
 
 #if defined(HAVE_DECL_H_ERRNO) && !HAVE_DECL_H_ERRNO
@@ -60,6 +66,13 @@ extern int h_errno;
 # undef _THREAD_PRIVATE
 #endif
 #define _THREAD_PRIVATE(a,b,c) (c)
+
+/* to avoid conflicts where a platform already has _res */
+#ifdef _res
+# undef _res
+#endif
+#define _res    _compat_res
+
 struct __res_state _res;
 
 /* Necessary functions and macros */
@@ -290,10 +303,12 @@ getrrsetbyname(const char *hostname, unsigned int rdclass,
         }
 
         /* allocate memory for signatures */
-        rrset->rri_sigs = calloc(rrset->rri_nsigs, sizeof(struct rdatainfo));
-        if (rrset->rri_sigs == NULL) {
-                result = ERRSET_NOMEMORY;
-                goto fail;
+        if (rrset->rri_nsigs > 0) {
+                rrset->rri_sigs = calloc(rrset->rri_nsigs, sizeof(struct rdatainfo));
+                if (rrset->rri_sigs == NULL) {
+                        result = ERRSET_NOMEMORY;
+                        goto fail;
+                }
         }
 
         /* copy answers & signatures */