linux-kernel - [PATCH] fuse: fix bug in control filesystem mount

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Message-Id: <E1HBcTU-0002JB-00@dorka.pomaz.szeredi.hu>
Date:	Mon, 29 Jan 2007 20:47:32 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	torvalds@...l.org
CC:	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: [PATCH] fuse: fix bug in control filesystem mount

Linus, please apply before 2.6.20.  Thanks.


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@...redi.hu>

---
Index: linux/fs/fuse/control.c
===================================================================
--- linux.orig/fs/fuse/control.c	2007-01-29 20:40:50.000000000 +0100
+++ linux/fs/fuse/control.c	2007-01-29 20:40:52.000000000 +0100
@@ -193,8 +193,12 @@ static int fuse_ctl_get_sb(struct file_s
 
 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);
-
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