1 files changed, 5 insertions, 0 deletions
diff --git a/src/dns.c b/src/dns.c
index b070eba..cf089a8 100644
--- a/src/dns.c
+++ b/src/dns.c
@@ -53,6 +53,7 @@ const char* perf_dns_rcode_strings[] = {
 perf_result_t perf_dname_fromstring(const char* str, size_t len, perf_buffer_t* target)
 {
     size_t      label_len, at;
+    ssize_t     max      = 255;
     const char* orig_str = str;
     bool        is_quoted;
 
@@ -101,6 +102,10 @@ perf_result_t perf_dname_fromstring(const char* str, size_t len, perf_buffer_t*
         if (label_len > 63) {
             return PERF_R_FAILURE;
         }
+        max -= label_len + 1;
+        if (max < 0) {
+            return PERF_R_FAILURE;
+        }
         perf_buffer_putuint8(target, label_len);
         if (is_quoted) {
             for (at = 0; at < len; at++) {