linux-kernel - Re: [PATCH -next] drm/amdkfd: Fix NULL but dereferenced coccicheck error

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Message-ID: <8622afaf-6448-8932-9971-6bfaaa8c311a@amd.com>
Date:   Wed, 9 Feb 2022 16:14:49 -0500
From:   Felix Kuehling <felix.kuehling@....com>
To:     Yang Li <yang.lee@...ux.alibaba.com>, daniel@...ll.ch
Cc:     airlied@...ux.ie, alexander.deucher@....com,
        christian.koenig@....com, Xinhui.Pan@....com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Abaci Robot <abaci@...ux.alibaba.com>
Subject: Re: [PATCH -next] drm/amdkfd: Fix NULL but dereferenced coccicheck
 error


On 2022-02-08 20:39, Yang Li wrote:
> Eliminate the following coccicheck warning:
> ./drivers/gpu/drm/amd/amdkfd/kfd_chardev.c:2087:27-38: ERROR: bo_buckets
> is NULL but dereferenced.
>
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>

Thank you. I already picket up Tom Rix's patch for the same issue.

Regards,
   Felix


> ---
>   drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 6 ++----
>   1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> index 64e3b4e3a712..636391c61caf 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> @@ -1982,10 +1982,8 @@ static int criu_checkpoint_bos(struct kfd_process *p,
>   	void *mem;
>   
>   	bo_buckets = kvzalloc(num_bos * sizeof(*bo_buckets), GFP_KERNEL);
> -	if (!bo_buckets) {
> -		ret = -ENOMEM;
> -		goto exit;
> -	}
> +	if (!bo_buckets)
> +		return -ENOMEM;
>   
>   	bo_privs = kvzalloc(num_bos * sizeof(*bo_privs), GFP_KERNEL);
>   	if (!bo_privs) {