linux-kernel - Re: [PATCH 07/15] hfs: avoid crash in hfs_bnode

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Message-Id: <D666C431-DAD2-4189-9716-564602705D82@dubeyko.com>
Date:	Tue, 7 May 2013 23:05:26 +0400
From:	Vyacheslav Dubeyko <slava@...eyko.com>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	jirislaby@...il.com, linux-kernel@...r.kernel.org,
	Jeff Mahoney <jeffm@...e.com>, linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 07/15] hfs: avoid crash in hfs_bnode_create

On May 7, 2013, at 6:18 PM, Jiri Slaby wrote:

> 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.
> 
> 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>
> ---
> 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..6d435c2 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) {
> +		printk(KERN_CRIT "new node %u already hashed?\n", num);

The error/debug subsystem of HFS/HFS+ was reworked by Joe Perches, recently. Please, change printk() on pr_crit().

Thanks,
Vyacheslav Dubeyko.

> +		WARN_ON(1);
> +		return node;
> +	}
> 	node = __hfs_bnode_create(tree, num);
> 	if (!node)
> 		return ERR_PTR(-ENOMEM);
> -- 
> 1.8.2.1
> 
> --
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