[PATCH] fuse: fix bug in control filesystem mount

The BUG in fuse_ctl_add_dentry() could be triggered if the control
filesystem was unmounted and mounted again while one or more fuse
filesystems were present.

The fix is to reset the dentry counter in fuse_ctl_kill_sb().

Bug reported by Florent Mertens.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/fuse/control.c b/fs/fuse/control.c
index 8c58bd4539936d536ada3b3b98596002db5badd8..1794305f9ed86696f7505afdb90f591f32181e1c 100644 (file)
--- a/fs/fuse/control.c
+++ b/fs/fuse/control.c
@@ -193,8 +193,12 @@ static int fuse_ctl_get_sb(struct file_system_type *fs_type, int flags,
 
 static void fuse_ctl_kill_sb(struct super_block *sb)
 {
+       struct fuse_conn *fc;
+
        mutex_lock(&fuse_mutex);
        fuse_control_sb = NULL;
+       list_for_each_entry(fc, &fuse_conn_list, entry)
+               fc->ctl_ndents = 0;
        mutex_unlock(&fuse_mutex);
 
        kill_litter_super(sb);