linux-kernel - [PATCH v2 07/14] hfs: avoid crash in hfs_bnode

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Date:	Wed,  8 May 2013 17:26:04 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	jirislaby@...il.com
Cc:	linux-kernel@...r.kernel.org, Jeff Mahoney <jeffm@...e.com>,
	Jiri Slaby <jslaby@...e.cz>, linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vyacheslav Dubeyko <slava@...eyko.com>
Subject: [PATCH v2 07/14] hfs: avoid crash in hfs_bnode_create

From: Jeff Mahoney <jeffm@...e.com>

Commit 634725a92938b0f282b17cec0b007dca77adebd2 removed the BUG_ON in
hfs_bnode_create in hfsplus. This patch removes it from the hfs
version and avoids an fsfuzzer crash.

[v2]
- use pr_crit (per Vyacheslav)

Signed-off-by: Jeff Mahoney <jeffm@...e.com>
Acked-by: Jeff Mahoney <jeffm@...e.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: linux-fsdevel@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Vyacheslav Dubeyko <slava@...eyko.com>
---
 fs/hfs/bnode.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/hfs/bnode.c b/fs/hfs/bnode.c
index f3b1a15..d3fa6bd 100644
--- a/fs/hfs/bnode.c
+++ b/fs/hfs/bnode.c
@@ -415,7 +415,11 @@ struct hfs_bnode *hfs_bnode_create(struct hfs_btree *tree, u32 num)
 	spin_lock(&tree->hash_lock);
 	node = hfs_bnode_findhash(tree, num);
 	spin_unlock(&tree->hash_lock);
-	BUG_ON(node);
+	if (node) {
+		pr_crit("new node %u already hashed?\n", num);
+		WARN_ON(1);
+		return node;
+	}
 	node = __hfs_bnode_create(tree, num);
 	if (!node)
 		return ERR_PTR(-ENOMEM);
-- 
1.8.2.2

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