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diff --git a/str2host.c b/str2host.c
index b274b17..f2a317b 100644
--- a/str2host.c
+++ b/str2host.c
@@ -1525,8 +1525,10 @@ ldns_str2rdf_long_str(ldns_rdf **rd, const char *str)
if (! str) {
return LDNS_STATUS_SYNTAX_BAD_ESCAPE;
}
- length = (size_t)(dp - data);
-
+ if (!(length = (size_t)(dp - data))) {
+ LDNS_FREE(data);
+ return LDNS_STATUS_SYNTAX_EMPTY;
+ }
/* Lose the overmeasure */
data = LDNS_XREALLOC(dp = data, uint8_t, length);
if (! data) {
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