linux-kernel - Re: [PATCH][next] KEYS: trusted: Fix missing null return from kzalloc call

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Date:   Tue, 13 Apr 2021 10:58:43 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     Colin King <colin.king@...onical.com>
Cc:     James Bottomley <jejb@...ux.ibm.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        David Howells <dhowells@...hat.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        linux-integrity <linux-integrity@...r.kernel.org>,
        "open list:ASYMMETRIC KEYS" <keyrings@...r.kernel.org>,
        "open list:SECURITY SUBSYSTEM" 
        <linux-security-module@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] KEYS: trusted: Fix missing null return from kzalloc call

On Mon, 12 Apr 2021 at 21:31, Colin King <colin.king@...onical.com> wrote:
>
> From: Colin Ian King <colin.king@...onical.com>
>
> The kzalloc call can return null with the GFP_KERNEL flag so
> add a null check and exit via a new error exit label. Use the
> same exit error label for another error path too.
>
> Addresses-Coverity: ("Dereference null return value")
> Fixes: 830027e2cb55 ("KEYS: trusted: Add generic trusted keys framework")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  security/keys/trusted-keys/trusted_core.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>

Ah, it's my bad. Thanks for fixing this issue.

Reviewed-by: Sumit Garg <sumit.garg@...aro.org>

-Sumit

> diff --git a/security/keys/trusted-keys/trusted_core.c b/security/keys/trusted-keys/trusted_core.c
> index ec3a066a4b42..90774793f0b1 100644
> --- a/security/keys/trusted-keys/trusted_core.c
> +++ b/security/keys/trusted-keys/trusted_core.c
> @@ -116,11 +116,13 @@ static struct trusted_key_payload *trusted_payload_alloc(struct key *key)
>
>         ret = key_payload_reserve(key, sizeof(*p));
>         if (ret < 0)
> -               return p;
> +               goto err;
>         p = kzalloc(sizeof(*p), GFP_KERNEL);
> +       if (!p)
> +               goto err;
>
>         p->migratable = migratable;
> -
> +err:
>         return p;
>  }
>
> --
> 2.30.2
>