linux-kernel - Re: [PATCH] Keys: Remove redundant initialization of cred

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Message-ID: <YJhJVEqIZAkU9xzp@kernel.org>
Date:   Sun, 9 May 2021 23:43:00 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Yang Li <yang.lee@...ux.alibaba.com>
Cc:     dhowells@...hat.com, jmorris@...ei.org, serge@...lyn.com,
        nathan@...nel.org, ndesaulniers@...gle.com,
        keyrings@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] Keys: Remove redundant initialization of cred

On Sat, May 08, 2021 at 05:51:21PM +0800, Yang Li wrote:
> Pointer cred is being initialized however this value is never
> read as cred is assigned an updated value from the returned
> call to get_current_cred(). Remove the redundant initialization.
> 
> Cleans up clang warning:
> 
> security/keys/request_key.c:119:21: warning: Value stored to 'cred'
> during its initialization is never read
> [clang-analyzer-deadcode.DeadStores]
> 
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Fixes: 'commit bb952bb98a7e ("CRED: Separate per-task-group keyrings from signal_struct")'
> Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>
> ---
>  security/keys/request_key.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/security/keys/request_key.c b/security/keys/request_key.c
> index 2da4404..873c31f 100644
> --- a/security/keys/request_key.c
> +++ b/security/keys/request_key.c
> @@ -116,7 +116,7 @@ static int call_sbin_request_key(struct key *authkey, void *aux)
>  {
>  	static char const request_key[] = "/sbin/request-key";
>  	struct request_key_auth *rka = get_request_key_auth(authkey);
> -	const struct cred *cred = current_cred();
> +	const struct cred *cred;
>  	key_serial_t prkey, sskey;
>  	struct key *key = rka->target_key, *keyring, *session, *user_session;
>  	char *argv[9], *envp[3], uid_str[12], gid_str[12];
> -- 
> 1.8.3.1
> 
> 

Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

/Jarkko