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Tue, 27 Jan 2026 08:43:15 -0800 (PST) Received: from junjungu-PC.localdomain ([223.166.246.160]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c635a1307a1sm11187307a12.5.2026.01.27.08.43.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jan 2026 08:43:15 -0800 (PST) From: Felix Gu Date: Wed, 28 Jan 2026 00:43:10 +0800 Subject: [PATCH] drm/tegra: dc: Fix device node reference leak in tegra_dc_has_output() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260128-dc-v1-1-a88205826301@gmail.com> X-B4-Tracking: v=1; b=H4sIAB3reGkC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDIzMDQyNz3ZRk3VRjS7PEJFNjC5OURCWgwoKi1LTMCrAh0bG1tQD4XkIUVAA AAA== X-Change-ID: 20260127-dc-e396ab5384da To: Thierry Reding , Mikko Perttunen , David Airlie , Simona Vetter , Jonathan Hunter Cc: Thierry Reding , dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, Felix Gu X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1769532192; l=1230; i=ustc.gu@gmail.com; h=from:subject:message-id; bh=jvSrjyI0rNYJ8C8R56pXxeLDoon1cGjhsNLYQXraWfE=; b=zAg99uNto1mob2shUsiEV5w4TAfuo/rwrqM+hVIS9lQ63dW5WkF0SDAfWkvE+yX7MT5qx765p W/5FyvToi+QCrFPSeh2AtelSmLjoTdDxfD3R9Qr8tLWnFjjJVJfMcVN X-Developer-Key: i=ustc.gu@gmail.com; a=ed25519; pk=fjUXwmjchVN7Ja6KGP55IXOzFeCl9edaHoQIEUA+/hw= The of_for_each_phandle() macro increments the reference count of the device node it iterates over. If the loop exits early, the reference must be released manually. In tegra_dc_has_output(), the function returns true immediately when a match is found, failing to release the current node's reference. Fix this by adding a call to of_node_put() before returning from the loop. Fixes: c57997bce423 ("drm/tegra: sor: Add Tegra186 support") Signed-off-by: Felix Gu Acked-by: Mikko Perttunen --- drivers/gpu/drm/tegra/dc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c index 01e9d5011dd8..9bf6c008a5ea 100644 --- a/drivers/gpu/drm/tegra/dc.c +++ b/drivers/gpu/drm/tegra/dc.c @@ -101,8 +101,10 @@ bool tegra_dc_has_output(struct tegra_dc *dc, struct d= evice *dev) int err; =20 of_for_each_phandle(&it, err, np, "nvidia,outputs", NULL, 0) - if (it.node =3D=3D dev->of_node) + if (it.node =3D=3D dev->of_node) { + of_node_put(it.node); return true; + } =20 return false; } --- base-commit: 615aad0f61e0c7a898184a394dc895c610100d4f change-id: 20260127-dc-e396ab5384da Best regards, --=20 Felix Gu