linux-kernel - Re: [PATCH][next] selinux: fix allocation failure check on newpolicy->sidtab

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Date:   Wed, 19 Aug 2020 08:21:54 -0400
From:   Stephen Smalley <stephen.smalley.work@...il.com>
To:     Colin King <colin.king@...onical.com>,
        Paul Moore <paul@...l-moore.com>,
        Eric Paris <eparis@...isplace.org>,
        Ondrej Mosnacek <omosnace@...hat.com>, selinux@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] selinux: fix allocation failure check on
 newpolicy->sidtab

On 8/19/20 6:42 AM, Colin King wrote:

> From: Colin Ian King <colin.king@...onical.com>
>
> The allocation check of newpolicy->sidtab is null checking if
> newpolicy is null and not newpolicy->sidtab. Fix this.
>
> Addresses-Coverity: ("Logically dead code")
> Fixes: c7c556f1e81b ("selinux: refactor changing booleans")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
Acked-by: Stephen Smalley <stephen.smalley.work@...il.com>
> ---
>   security/selinux/ss/services.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
> index f6f78c65f53f..d310910fb639 100644
> --- a/security/selinux/ss/services.c
> +++ b/security/selinux/ss/services.c
> @@ -2224,7 +2224,7 @@ int security_load_policy(struct selinux_state *state, void *data, size_t len,
>   		return -ENOMEM;
>   
>   	newpolicy->sidtab = kzalloc(sizeof(*newpolicy->sidtab), GFP_KERNEL);
> -	if (!newpolicy)
> +	if (!newpolicy->sidtab)
>   		goto err;
>   
>   	rc = policydb_read(&newpolicy->policydb, fp);