linux-kernel - Re: [PATCH] drm/meson: Fix refcount leak in meson_encoder_hdmi

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <e778d50a-81c6-6dfa-a58b-73cda452f4e3@gmail.com>
Date:   Thu, 12 May 2022 19:17:00 +0800
From:   Miaoqian Lin <linmq006@...il.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Sam Ravnborg <sam@...nborg.org>,
        dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/meson: Fix refcount leak in meson_encoder_hdmi_init

Hi,

On 2022/5/12 17:32, Neil Armstrong wrote:
> Hi,
>
> On 12/05/2022 11:21, Miaoqian Lin wrote:
>> of_find_device_by_node() takes a reference to the embedded struct device,
>> we should use put_device() to release it when not need anymore.
>> Add missing put_device() in error path to avoid refcount leak.
>>
>> Fixes: 0af5e0b41110 ("drm/meson: encoder_hdmi: switch to bridge DRM_BRIDGE_ATTACH_NO_CONNECTOR")
>> Signed-off-by: Miaoqian Lin <linmq006@...il.com>
>
> You already sent the same patch yesterday, please avoid this.
>
Sorry for the mistake, I realized this after I sent it. I will be more careful.


> Neil
>
>> ---
>>   drivers/gpu/drm/meson/meson_encoder_hdmi.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/meson/meson_encoder_hdmi.c b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
>> index 5e306de6f485..de87f02cd388 100644
>> --- a/drivers/gpu/drm/meson/meson_encoder_hdmi.c
>> +++ b/drivers/gpu/drm/meson/meson_encoder_hdmi.c
>> @@ -435,8 +435,10 @@ int meson_encoder_hdmi_init(struct meson_drm *priv)
>>           cec_fill_conn_info_from_drm(&conn_info, meson_encoder_hdmi->connector);
>>             notifier = cec_notifier_conn_register(&pdev->dev, NULL, &conn_info);
>> -        if (!notifier)
>> +        if (!notifier) {
>> +            put_device(&pdev->dev);
>>               return -ENOMEM;
>> +        }
>>             meson_encoder_hdmi->cec_notifier = notifier;
>>       }
>