--- xine-lib-1.1.14.orig/src/demuxers/demux_qt.c
+++ xine-lib-1.1.14/src/demuxers/demux_qt.c
@@ -739,49 +739,49 @@
     if (current_atom == ART_ATOM) {
       string_size = _X_BE_32(&meta_atom[i + 4]) - 16 + 1;
       info->artist = xine_xmalloc(string_size);
-      if (info->artist) {
+      if (string_size && info->artist) {
         strncpy(info->artist, &meta_atom[i + 20], string_size - 1);
         info->artist[string_size - 1] = 0;
       }
     } else if (current_atom == NAM_ATOM) {
       string_size = _X_BE_32(&meta_atom[i + 4]) - 16 + 1;
       info->name = xine_xmalloc(string_size);
-      if (info->name) {
+      if (string_size && info->name) {
         strncpy(info->name, &meta_atom[i + 20], string_size - 1);
         info->name[string_size - 1] = 0;
       }
     } else if (current_atom == ALB_ATOM) {
       string_size = _X_BE_32(&meta_atom[i + 4]) - 16 + 1;
       info->album = xine_xmalloc(string_size);
-      if (info->album) {
+      if (string_size && info->album) {
         strncpy(info->album, &meta_atom[i + 20], string_size - 1);
         info->album[string_size - 1] = 0;
       }
     } else if (current_atom == GEN_ATOM) {
       string_size = _X_BE_32(&meta_atom[i + 4]) - 16 + 1;
       info->genre = xine_xmalloc(string_size);
-      if (info->genre) {
+      if (string_size && info->genre) {
         strncpy(info->genre, &meta_atom[i + 20], string_size - 1);
         info->genre[string_size - 1] = 0;
       }
     } else if (current_atom == TOO_ATOM) {
       string_size = _X_BE_32(&meta_atom[i + 4]) - 16 + 1;
       info->comment = xine_xmalloc(string_size);
-      if (info->comment) {
+      if (string_size && info->comment) {
         strncpy(info->comment, &meta_atom[i + 20], string_size - 1);
         info->comment[string_size - 1] = 0;
       }
     } else if (current_atom == WRT_ATOM) {
       string_size = _X_BE_32(&meta_atom[i + 4]) - 16 + 1;
       info->composer = xine_xmalloc(string_size);
-      if (info->composer) {
+      if (string_size && info->composer) {
         strncpy(info->composer, &meta_atom[i + 20], string_size - 1);
         info->composer[string_size - 1] = 0;
       }
     } else if (current_atom == DAY_ATOM) {
       string_size = _X_BE_32(&meta_atom[i + 4]) - 16 + 1;
       info->year = xine_xmalloc(string_size);
-      if (info->year) {
+      if (string_size && info->year) {
         strncpy(info->year, &meta_atom[i + 20], string_size - 1);
         info->year[string_size - 1] = 0;
       }