Prevent out of bounds (2)

netpass · Dec 19, 2019 · 5978352 · 5978352
1 parent 2b7c929
commit 5978352
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/app/src/main/jni/netguard/dns.c b/app/src/main/jni/netguard/dns.c
@@ -22,6 +22,9 @@
 int32_t get_qname(const uint8_t *data, const size_t datalen, uint16_t off, char *qname) {
     *qname = 0;
 
+    if (off >= datalen)
+        return -1;
+
     uint16_t c = 0;
     uint8_t noff = 0;
     uint16_t ptr = off;