From nobody Wed Dec 17 10:46:14 2025 Received: from cstnet.cn (smtp21.cstnet.cn [159.226.251.21]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7E4AE28507E; Wed, 22 Oct 2025 11:47:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761133663; cv=none; b=kT/Qwc949YktX7eLWv5NmC+iHnESyShlR1yBVOANMCeXg89y2MyAoS2WyEPXtM/G7mwBFrqyuqDLXZ74E1yi6rXyMGt7Prt3bUwHLDb/QXWhWYAoF2Ikkcm6sCmhu4r9zrueDlUQhaKhD6ygueWVc4uvV9CFeS7F4bNBCvTJdMA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761133663; c=relaxed/simple; bh=zSpjC6m3pglcmLbIGjS2FcUdLFf8FTEZflp0fi6fCj0=; h=From:To:Cc:Subject:Date:Message-Id; b=pniMGorTT0AmK2H3AEcDBpGvN6DFdF7xhFLSm+Nh1G1bckWXGT6uBh1nqHs4Hq70F/mGoc8jcs3n5yp0/YZ3r3Yb7i/+QiSgy8vH1x1vEG4WT+QmmtuR/FrsDXmtx293RheQjp8n5XGGCutdSgM1Hmidm+y32DjxfnsYos1IHWg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from localhost.localdomain (unknown [202.112.113.212]) by APP-01 (Coremail) with SMTP id qwCowAAHYKJJxPhosYX2Ew--.12754S2; Wed, 22 Oct 2025 19:47:30 +0800 (CST) From: Ma Ke To: thierry.reding@gmail.com, mperttunen@nvidia.com, airlied@gmail.com, simona@ffwll.ch, jonathanh@nvidia.com Cc: dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Ma Ke , stable@vger.kernel.org Subject: [PATCH RESEND] drm/tegra: dc: fix reference leak in tegra_dc_couple() Date: Wed, 22 Oct 2025 19:47:20 +0800 Message-Id: <20251022114720.24937-1-make24@iscas.ac.cn> X-Mailer: git-send-email 2.17.1 X-CM-TRANSID: qwCowAAHYKJJxPhosYX2Ew--.12754S2 X-Coremail-Antispam: 1UD129KBjvdXoW7Xw15uFW5Zr1rAFy5KFW3Jrb_yoWfuFg_GF yUZryxW3yaqFsY9FnFvr13Zry2yFyq9FW0gr42k393Gry3XFyqg34jgFZ09ryUWa1UWFn8 AayrXr40vF12kjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbD8FF20E14v26r4j6ryUM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8w A2z4x0Y4vE2Ix0cI8IcVAFwI0_JFI_Gr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr0_ Cr1l84ACjcxK6I8E87Iv67AKxVWxJr0_GcWl84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s 0DM2vYz4IE04k24VAvwVAKI4IrM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI 64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8Jw Am72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAG YxC7M4IIrI8v6xkF7I0E8cxan2IY04v7MxkF7I0En4kS14v26r1q6r43MxkIecxEwVAFwV W8KwCF04k20xvY0x0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v2 6r1j6r18MI8I3I0E7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2 Ij64vIr41lIxAIcVC0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_ Gr0_Cr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMI IF0xvEx4A2jsIEc7CjxVAFwI0_Gr0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x0JU6GQhUUUUU = X-CM-SenderInfo: ppdnvj2u6l2u1dvotugofq/ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" driver_find_device() calls get_device() to increment the reference count once a matching device is found, but there is no put_device() to balance the reference count. To avoid reference count leakage, add put_device() to decrease the reference count. Found by code review. Cc: stable@vger.kernel.org Fixes: a31500fe7055 ("drm/tegra: dc: Restore coupling of display controller= s") Signed-off-by: Ma Ke Acked-by: Mikko Perttunen --- drivers/gpu/drm/tegra/dc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c index 59d5c1ba145a..6c84bd69b11f 100644 --- a/drivers/gpu/drm/tegra/dc.c +++ b/drivers/gpu/drm/tegra/dc.c @@ -3148,6 +3148,7 @@ static int tegra_dc_couple(struct tegra_dc *dc) dc->client.parent =3D &parent->client; =20 dev_dbg(dc->dev, "coupled to %s\n", dev_name(companion)); + put_device(companion); } =20 return 0; --=20 2.17.1