linux-kernel - Re: [PATCH] crypto: cleanup warning in qm_get_qos

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Date:   Tue, 21 Dec 2021 14:31:14 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     trix@...hat.com
Cc:     wangzhou1@...ilicon.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, ndesaulniers@...gle.com,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH] crypto: cleanup warning in qm_get_qos_value()

On Tue, Dec 21, 2021 at 12:59:53PM -0800, trix@...hat.com wrote:
> From: Tom Rix <trix@...hat.com>
> 
> Building with clang static analysis returns this warning:
> 
> qm.c:4382:11: warning: The left operand of '==' is a garbage value
>         if (*val == 0 || *val > QM_QOS_MAX_VAL || ret) {
>             ~~~~ ^
> 
> The call to qm_qos_value_init() can return an error without setting
> *val.  So check ret before checking *val.
> 
> Signed-off-by: Tom Rix <trix@...hat.com>

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

Should this have a fixes tag?

Fixes: 72b010dc33b9 ("crypto: hisilicon/qm - supports writing QoS int the host")

> ---
>  drivers/crypto/hisilicon/qm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
> index b1fe9c7b8cc89..c906f2e59277b 100644
> --- a/drivers/crypto/hisilicon/qm.c
> +++ b/drivers/crypto/hisilicon/qm.c
> @@ -4379,7 +4379,7 @@ static ssize_t qm_get_qos_value(struct hisi_qm *qm, const char *buf,
>  		return -EINVAL;
>  
>  	ret = qm_qos_value_init(val_buf, val);
> -	if (*val == 0 || *val > QM_QOS_MAX_VAL || ret) {
> +	if (ret || *val == 0 || *val > QM_QOS_MAX_VAL) {
>  		pci_err(qm->pdev, "input qos value is error, please set 1~1000!\n");
>  		return -EINVAL;
>  	}
> -- 
> 2.26.3
>