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Mon, 27 Oct 2025 01:45:35 -0700 (PDT) Received: from localhost.localdomain ([124.77.218.104]) by smtp.googlemail.com with ESMTPSA id d2e1a72fcca58-7a41404dddcsm7300209b3a.38.2025.10.27.01.45.31 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 27 Oct 2025 01:45:34 -0700 (PDT) From: Miaoqian Lin To: Thierry Reding , Mikko Perttunen , David Airlie , Simona Vetter , Jonathan Hunter , Dmitry Osipenko , dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Cc: linmq006@gmail.com, stable@vger.kernel.org Subject: [PATCH] drm/tegra: Fix reference count leak in tegra_dc_couple Date: Mon, 27 Oct 2025 16:45:18 +0800 Message-Id: <20251027084519.80009-1-linmq006@gmail.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The driver_find_device() function returns a device with its reference count incremented. The caller is responsible for calling put_device() to release this reference when done. Fix this leak by adding the missing put_device() call. Found via static analysis. Fixes: f68ba6912bd2 ("drm/tegra: dc: Link DC1 to DC0 on Tegra20") Cc: stable@vger.kernel.org Signed-off-by: Miaoqian Lin --- 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 2.39.5 (Apple Git-154)