linux-kernel - Re: [PATCH v2] drm/selftests/test-drm_dp_mst_helper: Fix memory leak in sideband_msg_req_encode

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Message-ID: <YegqnfDXHmxUBWxI@phenom.ffwll.local>
Date:   Wed, 19 Jan 2022 16:13:33 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     José Expósito <jose.exposito89@...il.com>
Cc:     airlied@...ux.ie, daniel@...ll.ch, lee.jones@...aro.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/selftests/test-drm_dp_mst_helper: Fix memory leak
 in sideband_msg_req_encode_decode

On Sat, Jan 08, 2022 at 05:58:12PM +0100, José Expósito wrote:
> Avoid leaking the "out" variable if it is not possible to allocate
> the "txmsg" variable.
> 
> Fixes: 09234b88ef55 ("drm/selftests/test-drm_dp_mst_helper: Move 'sideband_msg_req_encode_decode' onto the heap")
> Addresses-Coverity-ID: 1475685 ("Resource leak")
> Signed-off-by: José Expósito <jose.exposito89@...il.com>
> 
> ---
> 
> v2: Improve commit message

Applied to drm-misc-next, thanks.
-Daniel

> ---
>  drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
> index 6b4759ed6bfd..c491429f1a02 100644
> --- a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
> +++ b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
> @@ -131,8 +131,10 @@ sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in)
>  		return false;
>  
>  	txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
> -	if (!txmsg)
> +	if (!txmsg) {
> +		kfree(out);
>  		return false;
> +	}
>  
>  	drm_dp_encode_sideband_req(in, txmsg);
>  	ret = drm_dp_decode_sideband_req(txmsg, out);
> -- 
> 2.25.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch