linux-ext4 - Re: [PATCH] ext4 crypto: remove unneeded assignation

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Date:	Wed, 08 Jul 2015 12:55:39 -0700
From:	Joe Perches <joe@...ches.com>
To:	Laurent Navet <laurent.navet@...il.com>
Cc:	tytso@....edu, adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext4 crypto: remove unneeded assignation

On Wed, 2015-07-08 at 21:51 +0200, Laurent Navet wrote:
> Return value of ext4_derive_key_aes() is stored but never used before
> being overwritten.
> Also fix coverity CID 1309760.
> 
> Signed-off-by: Laurent Navet <laurent.navet@...il.com>
> ---
>  fs/ext4/crypto_key.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/ext4/crypto_key.c b/fs/ext4/crypto_key.c
> index 442d24e..92f9172 100644
> --- a/fs/ext4/crypto_key.c
> +++ b/fs/ext4/crypto_key.c
> @@ -218,7 +218,7 @@ retry:
>  	BUILD_BUG_ON(EXT4_AES_128_ECB_KEY_SIZE !=
>  		     EXT4_KEY_DERIVATION_NONCE_SIZE);
>  	BUG_ON(master_key->size != EXT4_AES_256_XTS_KEY_SIZE);
> -	res = ext4_derive_key_aes(ctx.nonce, master_key->raw,
> +	ext4_derive_key_aes(ctx.nonce, master_key->raw,
>  				  raw_key);

More likely this should be:

	res = ext4_derive_key_aes(,,,);
	if (res)
		goto out;

>  got_key:
>  	ctfm = crypto_alloc_ablkcipher(cipher_str, 0, 0);



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