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Thu, 14 May 2026 10:15:13 -0700 (PDT) Received: from localhost.localdomain ([82.215.118.79]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48fe4c90b27sm6314265e9.8.2026.05.14.10.15.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 May 2026 10:15:12 -0700 (PDT) From: Stepan Ionichev To: andriy.shevchenko@linux.intel.com Cc: djrscally@gmail.com, heikki.krogerus@linux.intel.com, sakari.ailus@linux.intel.com, gregkh@linuxfoundation.org, rafael@kernel.org, dakr@kernel.org, linux-acpi@vger.kernel.org, driver-core@lists.linux.dev, linux-kernel@vger.kernel.org, sozdayvek@gmail.com Subject: [PATCH] device property: fix fwnode reference leak in fwnode_graph_get_endpoint_by_id() Date: Thu, 14 May 2026 22:14:55 +0500 Message-Id: <20260514171455.27271-1-sozdayvek@gmail.com> X-Mailer: git-send-email 2.33.0.windows.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit When called with FWNODE_GRAPH_ENDPOINT_NEXT, the function walks every endpoint under the requested port and, for any endpoint whose ID is greater than or equal to the requested one, may store a fwnode reference in best_ep via fwnode_handle_get(). If a later iteration finds an exact-ID match, the function returns that endpoint directly without dropping the reference held by best_ep, leaking it. Drop the saved candidate before returning the exact-match endpoint. This affects callers that use FWNODE_GRAPH_ENDPOINT_NEXT to ask for the next endpoint with ID >= the requested one (used by a number of media drivers, e.g. imx7/8, sun6i CSI, omap3isp, xilinx-csi2, stm32-csi). Each leak retains a fwnode reference until reboot/unbind. Fixes: 0fcc2bdc8aff ("device property: Add fwnode_graph_get_endpoint_by_id()") Signed-off-by: Stepan Ionichev --- drivers/base/property.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/base/property.c b/drivers/base/property.c index 8e0148a37..e08eadd66 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -1277,8 +1277,10 @@ fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode, if (fwnode_ep.port != port) continue; - if (fwnode_ep.id == endpoint) + if (fwnode_ep.id == endpoint) { + fwnode_handle_put(best_ep); return ep; + } if (!endpoint_next) continue; -- 2.43.0