linux-ext4 - Re: [EXT4 set 5][PATCH 1/1] expand inode i_extra_isize to support features in larger inode

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Date:	Mon, 16 Jul 2007 18:06:33 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Mingming Cao <cmm@...ibm.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org, Andy Whitcroft <apw@...dowen.org>
Subject: Re: [EXT4 set 5][PATCH 1/1] expand inode i_extra_isize to support features in larger inode

On Jul 16, 2007  16:52 -0700, Mingming Cao wrote:
> I am not sure why we need GFP_KERNEL flag here. I think we should use
> GFP_NOFS instead. The following patch use the GFP_NOFS flag, as well as
> fixing memory leak issue introduced by the ext4 expand inode extra isize
> patch.
> 
> Fixing memory allocation issue with expand inode extra isize patch.
> 
> - use GFP_NOFS instead of GFP_KERNEL flag for memory allocation
> - use kzalloc instead of kmalloc

This doesn't need kzalloc() for buffer and b_entry_name, since they are
immediately overwritten by memcpy().

> - fix memory leak in the success case, at the end of while loop.
>  			goto cleanup;
> @@ -1302,7 +1302,15 @@ retry:
>  		error = ext4_xattr_block_set(handle, inode, &i, bs);
>  		if (error)
>  			goto cleanup;
> +		kfree(b_entry_name);
> +		kfree(buffer);
> +		brelse(is->iloc.bh);
> +		kfree(is);
> +		kfree(bs);
> +		brelse(bh);
>  	}
> +	up_write(&EXT4_I(inode)->xattr_sem);
> +        return 0;
>  
>  cleanup:
>  	kfree(b_entry_name);

I don't think you should have brelse(bh) inside the loop, since it is
allocated before the loop starts.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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