linux-kernel - [PATCH] VFS: BUG() if somebody tries to rehash an already hashed dentry

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Date:	Wed, 17 Jun 2009 22:45:05 +0200
From:	Jan Blunck <jblunck@...e.de>
To:	viro@...IV.linux.org.uk
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	vaurora@...hat.com, hch@....de, miklos@...redi.hu
Subject: [PATCH] VFS: BUG() if somebody tries to rehash an already hashed dentry

Break early when somebody tries to rehash an already hashed dentry.
Otherwise this leads to interesting corruptions in the dcache hash table
later on.

Signed-off-by: Jan Blunck <jblunck@...e.de>
Signed-off-by: Valerie Aurora (Henson) <vaurora@...hat.com>
---
 fs/dcache.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/dcache.c b/fs/dcache.c
index 75659a6..191c488 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1550,6 +1550,7 @@ void d_rehash(struct dentry * entry)
 {
 	spin_lock(&dcache_lock);
 	spin_lock(&entry->d_lock);
+	BUG_ON(!d_unhashed(entry));
 	_d_rehash(entry);
 	spin_unlock(&entry->d_lock);
 	spin_unlock(&dcache_lock);
-- 
1.6.0.2

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