linux-ext4 - Re: [PATCH] ext4: Ensure that inode is non-NULL before calling ext4_error

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Date:	Wed, 2 Apr 2014 18:47:35 +0200
From:	Jan Kara <jack@...e.cz>
To:	Matthew Wilcox <willy@...ux.intel.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] ext4: Ensure that inode is non-NULL before calling
 ext4_error_inode

On Wed 02-04-14 10:36:30, Matthew Wilcox wrote:
> 
> __ext4_handle_dirty_metadata can be called with a NULL inode, but
> ext4_error_inode can't.  This is supposed to be a "can't happen" path,
> so we need to find out whether it can legitimately happen or whether
  It can legitimately happen - there is metadata (like bitmaps, inode
table, group descriptor) which doesn't belong to any inode. Thus we leave
inode argument as NULL for these.

> there's some other bug that is causing this to happen.  This prevents
> a NULL pointer reference, so it should be included regardless of what
> the underlying error is.
  I'd prefer wrapping that several-line error into braces. But whatever.
Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza
> 
> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@...el.com>
> ---
>  fs/ext4/ext4_jbd2.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
> index 3fe29de..383d586 100644
> --- a/fs/ext4/ext4_jbd2.c
> +++ b/fs/ext4/ext4_jbd2.c
> @@ -259,7 +259,8 @@ int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
>  		if (WARN_ON_ONCE(err)) {
>  			ext4_journal_abort_handle(where, line, __func__, bh,
>  						  handle, err);
> -			ext4_error_inode(inode, where, line,
> +			if (inode)
> +				ext4_error_inode(inode, where, line,
>  					 bh->b_blocknr,
>  					 "journal_dirty_metadata failed: "
>  					 "handle type %u started at line %u, "
> -- 
> 1.9.0
> 
> --
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-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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