diff --git a/lib/asn1/gen_length.c b/lib/asn1/gen_length.c
index da6d26e37..6284e5e9f 100644
--- a/lib/asn1/gen_length.c
+++ b/lib/asn1/gen_length.c
@@ -149,10 +149,9 @@ length_type (const char *name, const Type *t,
 	    if(t->type == TChoice)
 		fprintf(codefile, "case %s:\n", m->label);
 
-	    asprintf (&s, "%s(%s)->%s%s",
-		      m->optional ? "" : "&", name,
-		      t->type == TChoice ? "u." : "", m->gen_name);
-	    if (s == NULL)
+	    if (asprintf (&s, "%s(%s)->%s%s",
+			  m->optional ? "" : "&", name,
+			  t->type == TChoice ? "u." : "", m->gen_name) < 0 || s == NULL)
 		errx(1, "malloc");
 	    if (m->optional)
 		fprintf (codefile, "if(%s)", s);
@@ -183,8 +182,8 @@ length_type (const char *name, const Type *t,
     }
     case TSetOf:
     case TSequenceOf: {
-	char *n;
-	char *sname;
+	char *n = NULL;
+	char *sname = NULL;
 
 	fprintf (codefile,
 		 "{\n"
@@ -196,11 +195,9 @@ length_type (const char *name, const Type *t,
 	fprintf (codefile, "for(i = (%s)->len - 1; i >= 0; --i){\n", name);
 	fprintf (codefile, "int %s_for_oldret = %s;\n"
 		 "%s = 0;\n", tmpstr, variable, variable);
-	asprintf (&n, "&(%s)->val[i]", name);
-	if (n == NULL)
+	if (asprintf (&n, "&(%s)->val[i]", name) < 0  || n == NULL)
 	    errx(1, "malloc");
-	asprintf (&sname, "%s_S_Of", tmpstr);
-	if (sname == NULL)
+	if (asprintf (&sname, "%s_S_Of", tmpstr) < 0 || sname == NULL)
 	    errx(1, "malloc");
 	length_type(n, t->subtype, variable, sname);
 	fprintf (codefile, "%s += %s_for_oldret;\n",
@@ -248,9 +245,8 @@ length_type (const char *name, const Type *t,
 	fprintf (codefile, "/* NULL */\n");
 	break;
     case TTag:{
-    	char *tname;
-	asprintf(&tname, "%s_tag", tmpstr);
-	if (tname == NULL)
+    	char *tname = NULL;
+	if (asprintf(&tname, "%s_tag", tmpstr) < 0 || tname == NULL)
 	    errx(1, "malloc");
 	length_type (name, t->subtype, variable, tname);
 	fprintf (codefile, "ret += %lu + der_length_len (ret);\n",
diff --git a/lib/asn1/gen_template.c b/lib/asn1/gen_template.c
index e408faff5..9e09eb2d8 100644
--- a/lib/asn1/gen_template.c
+++ b/lib/asn1/gen_template.c
@@ -224,7 +224,8 @@ partial_offset(const char *basetype, const char *name, int need_offset)
     char *str;
     if (name == NULL || need_offset == 0)
 	return strdup("0");
-    asprintf(&str, "offsetof(struct %s, %s)", basetype, name);
+    if (asprintf(&str, "offsetof(struct %s, %s)", basetype, name) < 0 || str == NULL)
+	errx(1, "malloc");
     return str;
 }
 
@@ -273,7 +274,8 @@ tlist_header(struct tlist *t, const char *fmt, ...)
 {
     va_list ap;
     va_start(ap, fmt);
-    vasprintf(&t->header, fmt, ap);
+    if (vasprintf(&t->header, fmt, ap) < 0 || t->header == NULL)
+	errx(1, "malloc");
     va_end(ap);
 }
 
@@ -389,7 +391,8 @@ add_line(struct templatehead *t, const char *fmt, ...)
     struct template *q = calloc(1, sizeof(*q));
     va_list ap;
     va_start(ap, fmt);
-    vasprintf(&q->line, fmt, ap);
+    if (vasprintf(&q->line, fmt, ap) < 0 || q->line == NULL)
+	errx(1, "malloc");
     va_end(ap);
     ASN1_TAILQ_INSERT_TAIL(t, q, members);
     return q;
@@ -404,10 +407,11 @@ add_line_pointer(struct templatehead *t,
 {
     struct template *q;
     va_list ap;
-    char *tt;
+    char *tt = NULL;
 
     va_start(ap, ttfmt);
-    vasprintf(&tt, ttfmt, ap);
+    if (vasprintf(&tt, ttfmt, ap) < 0 || tt == NULL)
+	errx(1, "malloc");
     va_end(ap);
 
     q = add_line(t, "{ %s, %s, asn1_%s }", tt, offset, ptr);
@@ -543,7 +547,7 @@ template_members(struct templatehead *temp, const char *basetype, const char *na
 	struct template *q;
 	Member *m;
 	size_t count = 0, i;
-	char *bname;
+	char *bname = NULL;
 	FILE *f = get_code_file();
 
 	if (ASN1_TAILQ_EMPTY(t->members)) {
@@ -551,7 +555,8 @@ template_members(struct templatehead *temp, const char *basetype, const char *na
 	    break;
 	}
 
-	asprintf(&bname, "bmember_%s_%lu", name ? name : "", (unsigned long)t);
+	if (asprintf(&bname, "bmember_%s_%lu", name ? name : "", (unsigned long)t) < 0 || bname == NULL)
+	    errx(1, "malloc");
 	output_name(bname);
 
 	ASN1_TAILQ_FOREACH(m, t->members, members) {
@@ -584,7 +589,7 @@ template_members(struct templatehead *temp, const char *basetype, const char *na
 
 	ASN1_TAILQ_FOREACH(m, t->members, members) {
 	    char *newbasename = NULL;
-
+	    
 	    if (m->ellipsis)
 		continue;