linux-kernel - Re: [PATCH -next] drm/amd/display: Fix possible memleak in dp_trigger

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Message-ID: <62c4312b-9e92-23bb-0823-7f1aca125c0f@amd.com>
Date:   Thu, 10 Sep 2020 11:34:34 -0400
From:   Harry Wentland <harry.wentland@....com>
To:     YueHaibing <yuehaibing@...wei.com>, sunpeng.li@....com,
        alexander.deucher@....com, christian.koenig@....com,
        airlied@...ux.ie, daniel@...ll.ch, mikita.lipski@....com,
        eryk.brol@....com
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] drm/amd/display: Fix possible memleak in
 dp_trigger_hotplug()

On 2020-09-09 11:26 p.m., YueHaibing wrote:
> If parse_write_buffer_into_params() fails, we should free
> wr_buf before return.
> 
> Fixes: 6f77b2ac6280 ("drm/amd/display: Add connector HPD trigger debugfs entry")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>

Reviewed-by: Harry Wentland <harry.wentland@....com>

Harry

> ---
>   drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
> index 83da24aced45..11e16fbe484d 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
> @@ -1089,8 +1089,10 @@ static ssize_t dp_trigger_hotplug(struct file *f, const char __user *buf,
>   	if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
>   						(long *)param, buf,
>   						max_param_num,
> -						&param_nums))
> +						&param_nums)) {
> +		kfree(wr_buf);
>   		return -EINVAL;
> +	}
>   
>   	if (param_nums <= 0) {
>   		DRM_DEBUG_DRIVER("user data not be read\n");
>