linux-kernel - Re: [patch] drm/amdgpu: potential NULL dereference in debugfs code

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Message-ID: <0d178bc4-49e3-4073-2ccc-d0d196d6f5db@amd.com>
Date:   Wed, 12 Oct 2016 11:20:41 +0200
From:   Christian König <christian.koenig@....com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Alex Deucher <alexander.deucher@....com>,
        Tom St Denis <tom.stdenis@....com>
CC:     David Airlie <airlied@...ux.ie>,
        Chunming Zhou <David1.Zhou@....com>,
        "Monk Liu" <Monk.Liu@....com>, Junwei Zhang <Jerry.Zhang@....com>,
        Jammy Zhou <Jammy.Zhou@....com>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: Re: [patch] drm/amdgpu: potential NULL dereference in debugfs code

Am 12.10.2016 um 08:17 schrieb Dan Carpenter:
> debugfs_create_file() returns NULL on error, it only returns error
> pointers if debugfs isn't enabled in the config and we checked for that
> earlier so it can't happen.
>
> Fixes: 4f4824b55650 ('drm/amd/amdgpu: Convert ring debugfs entries to binary')
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

Reviewed-by: Christian König <christian.koenig@....com>.

>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
> index 85aeb0a..8d16eaf 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
> @@ -371,8 +371,8 @@ static int amdgpu_debugfs_ring_init(struct amdgpu_device *adev,
>   	ent = debugfs_create_file(name,
>   				  S_IFREG | S_IRUGO, root,
>   				  ring, &amdgpu_debugfs_ring_fops);
> -	if (IS_ERR(ent))
> -		return PTR_ERR(ent);
> +	if (!ent)
> +		return -ENOMEM;
>   
>   	i_size_write(ent->d_inode, ring->ring_size + 12);
>   	ring->ent = ent;