Prevent a buffer overflow in diveToFile

Co-Authored-By: akunt
6 years ago · c2bdbdffaa
1 changed files with 1 additions and 2 deletions
--- a/Marlin/src/sd/cardreader.cpp
+++ b/Marlin/src/sd/cardreader.cpp
@ -622,9 +622,8 @@ const char* CardReader::diveToFile(SdFile*& curDir, const char * const path, con
  while (dirname_start) {
    char * const dirname_end = strchr(dirname_start, '/');
    if (dirname_end <= dirname_start) break;
-
-    char dosSubdirname[FILENAME_LENGTH];
    const uint8_t len = dirname_end - dirname_start;
+    char dosSubdirname[len + 1];
    strncpy(dosSubdirname, dirname_start, len);
    dosSubdirname[len] = 0;