linux-kernel - Re: [PATCH] apparmor: Return directly after a failed kzalloc() in two functions

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Date:   Sun, 9 Apr 2023 16:15:58 -0700
From:   John Johansen <john.johansen@...onical.com>
To:     Markus Elfring <Markus.Elfring@....de>,
        kernel-janitors@...r.kernel.org,
        linux-security-module@...r.kernel.org, apparmor@...ts.ubuntu.com,
        James Morris <jmorris@...ei.org>,
        Paul Moore <paul@...l-moore.com>,
        "Serge E. Hallyn" <serge@...lyn.com>
Cc:     cocci@...ia.fr, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] apparmor: Return directly after a failed kzalloc() in two
 functions

On 3/29/23 03:12, Markus Elfring wrote:
> Date: Wed, 29 Mar 2023 11:50:44 +0200
> 
> 1. Return directly after a call of the function “kzalloc” failed
>     at the beginning in these function implementations.
> 
> 2. Omit extra initialisations (for a few local variables)
>     which became unnecessary with this refactoring.
> 
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>

Acked-by: John Johansen <john.johansen@...onical.com>

thanks, I have pulled this into the apparmor tree

> ---
>   security/apparmor/crypto.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/security/apparmor/crypto.c b/security/apparmor/crypto.c
> index b498ed302461..6724e2ff6da8 100644
> --- a/security/apparmor/crypto.c
> +++ b/security/apparmor/crypto.c
> @@ -28,15 +28,15 @@ unsigned int aa_hash_size(void)
>   char *aa_calc_hash(void *data, size_t len)
>   {
>   	SHASH_DESC_ON_STACK(desc, apparmor_tfm);
> -	char *hash = NULL;
> -	int error = -ENOMEM;
> +	char *hash;
> +	int error;
> 
>   	if (!apparmor_tfm)
>   		return NULL;
> 
>   	hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
>   	if (!hash)
> -		goto fail;
> +		return ERR_PTR(-ENOMEM);
> 
>   	desc->tfm = apparmor_tfm;
> 
> @@ -62,7 +62,7 @@ int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
>   			 size_t len)
>   {
>   	SHASH_DESC_ON_STACK(desc, apparmor_tfm);
> -	int error = -ENOMEM;
> +	int error;
>   	__le32 le32_version = cpu_to_le32(version);
> 
>   	if (!aa_g_hash_policy)
> @@ -73,7 +73,7 @@ int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
> 
>   	profile->hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
>   	if (!profile->hash)
> -		goto fail;
> +		return -ENOMEM;
> 
>   	desc->tfm = apparmor_tfm;
> 
> --
> 2.40.0
>