playlist_next() now returns NULL on excessive 'step' amounts

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@1940 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 4 insertions, 0 deletions

diff --git a/apps/playlist.c b/apps/playlist.c
index 0ac848c59c..7e8ea36543 100644
--- a/apps/playlist.c
+++ b/apps/playlist.c
@@ -74,6 +74,10 @@ char* playlist_next(int steps, int* index)
     char dir_buf[MAX_PATH+1];
     char *dir_end;
 
+    if(abs(steps) > playlist.amount)
+        /* prevent madness when all files are empty/bad */
+        return NULL;
+
     playlist.index = (playlist.index+steps) % playlist.amount;
     while ( playlist.index < 0 ) {
         if ( global_settings.loop_playlist )