--- yaffs2/yaffs_fs.c	2007-10-19 19:55:42.000000000 +0800
+++ yaffs_fs.c	2007-10-19 20:45:56.254642424 +0800
@@ -1556,12 +1556,14 @@
 		memset(cur_opt,0,MAX_OPT_LEN+1);
 		p = 0;
 		
-		while(*options_str && *options_str != ','){
-			if(p < MAX_OPT_LEN){
+		while(*options_str){
+			if(p < MAX_OPT_LEN &&  *options_str != ','){
 				cur_opt[p] = *options_str;
 				p++;
 			}
 			options_str++;
+			if( *options_str == ',')
+				break;
 		}
 		
 		if(!strcmp(cur_opt,"inband-tags"))