Unionfs: do not over-decrement lower superblock refs on remount

Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>

diff --git a/fs/unionfs/super.c b/fs/unionfs/super.c
index 32a5887cabd84fee2de6d53ae5a34e5ccd7e5a17..8fc49e36e81e690feae4fef0e34cefa095c616c0 100644 (file)
--- a/fs/unionfs/super.c
+++ b/fs/unionfs/super.c
@@ -745,7 +745,7 @@ out_no_change:
        /* grab new lower super references; release old ones */
        for (i = 0; i < new_branches; i++)
                atomic_inc(&new_data[i].sb->s_active);
-       for (i = 0; i < new_branches; i++)
+       for (i = 0; i < sbmax(sb); i++)
                atomic_dec(&UNIONFS_SB(sb)->data[i].sb->s_active);
 
        /* copy new vectors into their correct place */