rr_read_TXT: Fix potential integer underflow leading to OOB read

videolabs · Mar 19, 2020 · f0e8a72 · f0e8a72
1 parent 0f5b814
commit f0e8a72
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/rr.c b/src/rr.c
@@ -171,7 +171,7 @@ rr_read_TXT(const uint8_t *ptr, size_t *n, const uint8_t *root, struct rr_entry
         if (*n == 0 || *n < len)
                 return (NULL);
 
-        for (; len > 0; len -= l + 1) {
+        for (; len > 0 && *n > 0; len -= l + 1) {
                 struct rr_data_txt *text;
 
                 memcpy(&l, ptr, sizeof(l));