linux-kernel - Re: [PATCH v2] accel/qaic: initialize ret variable to 0

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Date:   Wed, 17 May 2023 10:10:25 -0700
From:   Carl Vanderlip <quic_carlv@...cinc.com>
To:     Jeffrey Hugo <quic_jhugo@...cinc.com>, <trix@...hat.com>,
        <ogabbay@...nel.org>, <nathan@...nel.org>,
        <ndesaulniers@...gle.com>, <jacek.lawrynowicz@...ux.intel.com>,
        <stanislaw.gruszka@...ux.intel.com>, <quic_pkanojiy@...cinc.com>
CC:     <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, <llvm@...ts.linux.dev>
Subject: Re: [PATCH v2] accel/qaic: initialize ret variable to 0

On 5/17/2023 9:56 AM, Jeffrey Hugo wrote:
> From: Tom Rix <trix@...hat.com>
> 
> clang static analysis reports
> drivers/accel/qaic/qaic_data.c:610:2: warning: Undefined or garbage
>    value returned to caller [core.uninitialized.UndefReturn]
>          return ret;
>          ^~~~~~~~~~
> 
>>>From a code analysis of the function, the ret variable is only set some
> of the time but is always returned.  This suggests ret can return
> uninitialized garbage. However BO allocation will ensure ret is always
> set in reality.
> 
> Initialize ret to 0 to silence the warning.
> 
> Fixes: ff13be830333 ("accel/qaic: Add datapath")
> Signed-off-by: Tom Rix <trix@...hat.com>
> [jhugo: Reword commit text]
> Signed-off-by: Jeffrey Hugo <quic_jhugo@...cinc.com>
> ---
>   drivers/accel/qaic/qaic_data.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/accel/qaic/qaic_data.c b/drivers/accel/qaic/qaic_data.c
> index 8ab26e64b231..e42c1f9ffff8 100644
> --- a/drivers/accel/qaic/qaic_data.c
> +++ b/drivers/accel/qaic/qaic_data.c
> @@ -591,7 +591,7 @@ static int qaic_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struc
>   	struct qaic_bo *bo = to_qaic_bo(obj);
>   	unsigned long offset = 0;
>   	struct scatterlist *sg;
> -	int ret;
> +	int ret = 0;
>   
>   	if (obj->import_attach)
>   		return -EINVAL;


LGTM

Reviewed-by: Carl Vanderlip <quic_carlv@...cinc.com>