linux-kernel - Re: [PATCH] KEYS: use kfree

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Date:   Wed, 14 Jun 2023 17:49:47 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Mahmoud Adam <mngyadam@...zon.com>
Cc:     dhowells@...hat.com, davem@...emloft.net, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KEYS: use kfree_sensitive with key

On Tue, Jun 13, 2023 at 04:07:23PM +0000, Mahmoud Adam wrote:
> key member might contain private part of the key, so better use
> kfree_sensitive to free it
> 
> Signed-off-by: Mahmoud Adam <mngyadam@...zon.com>
> ---
>  crypto/asymmetric_keys/public_key.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c
> index eca5671ad3f2..006ae170a16f 100644
> --- a/crypto/asymmetric_keys/public_key.c
> +++ b/crypto/asymmetric_keys/public_key.c
> @@ -43,7 +43,7 @@ static void public_key_describe(const struct key *asymmetric_key,
>  void public_key_free(struct public_key *key)
>  {
>  	if (key) {
> -		kfree(key->key);
> +		kfree_sensitive(key->key);

The public key should not be freed with kfree_sensitive.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt