diff --git a/fs/vfs/bcache/src/bcache.c b/fs/vfs/bcache/src/bcache.c
index c1e763764c005be111300883edd2a0c15d6e527e..4c1e0732585e86a78c5f6dec969cbfb8ad3e3b8a 100644
--- a/fs/vfs/bcache/src/bcache.c
+++ b/fs/vfs/bcache/src/bcache.c
@@ -581,8 +581,11 @@ static OsBcacheBlock *AllocNewBlock(OsBcache *bc, BOOL read, UINT64 num)
         DelBlock(bc, prefer);
     }
 
+    if (prefer->used) { /* do not combine with next check */
+        MergeSyncBlocks(bc, prefer); /* prefer->used may be changed here */
+    }
+
     if (prefer->used) {
-        MergeSyncBlocks(bc, prefer);
         BcacheSyncBlock(bc, prefer);
         DelBlock(bc, prefer);
     }
diff --git a/fs/vfs/vnode.c b/fs/vfs/vnode.c
index fb0ce33052b7052348cac630e9263c4a6a7bcd9d..41fb043f7867440fcc941e655037da147e4b2545 100644
--- a/fs/vfs/vnode.c
+++ b/fs/vfs/vnode.c
@@ -260,7 +260,7 @@ int VnodeDrop(void)
 static char *NextName(char *pos, uint8_t *len)
 {
     char *name = NULL;
-    while (*pos == '/') {
+    while (*pos != 0 && *pos == '/') {
         pos++;
     }
     if (*pos == '\0') {