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Subject: [PATCH 0/5] i2c: fix device_node refcount leaks in 5 bus drivers Date: Sun, 16 Aug 2026 02:11:59 +0800 Message-ID: <20260815181204.2321-1-dragonliu2018@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series fixes device_node refcount leaks in 5 i2c bus drivers that share the same bug pattern: adap->dev.of_node = of_node_get(pdev->dev.of_node); Each driver calls of_node_get() to take an extra reference on the platform device's of_node when assigning it to the adapter device, but none of them drop it in the probe error paths nor in the remove() callback. device_release() does not call of_node_put(), and i2c_adapter_dev_release() only completes a struct, so the extra reference is never released, leaking the device_node on every probe failure and every adapter removal. Additionally, in the remove() callbacks, i2c_del_adapter() clears adap->dev with memset() at the end (commit bd4bc3dbded9 ("i2c: Clear i2c_adapter.dev on adapter removal")), which zeroes adap->dev.of_node before of_node_put() runs, turning it into a no-op. The fix caches the pointer before calling i2c_del_adapter(), the same approach used in i2c-mux (i2c_mux_del_adapters) and mtd (commit 56570bdad5e3 ("mtd: core: Fix refcount error in del_mtd_device()")). A related fix for the i2c-qcom-cci driver has already been submitted separately: https://lore.kernel.org/linux-i2c/20260815140931.53297-1-dragonliu2018@gmail.com/ These 5 drivers are the remaining i2c bus drivers that use of_node_get() on the adapter device; all other drivers either assign of_node directly (without taking an extra reference) or don't use Device Tree at all. Each patch has its own Fixes: tag pointing to the commit that introduced of_node_get() in the respective driver, and requests stable backport via Cc: stable@vger.kernel.org. Compile-tested with gcc on arm64 defconfig using COMPILE_TEST; no hardware available for runtime testing. Liu Zhenlong (5): i2c: mpc: fix device_node refcount leak in fsl_i2c_probe()/fsl_i2c_remove() i2c: cpm: fix device_node refcount leak in cpm_i2c_probe()/cpm_i2c_remove() i2c: ibm_iic: fix device_node refcount leak in iic_probe()/iic_remove() i2c: opal: fix device_node refcount leak in i2c_opal_probe/remove() i2c: pnx: fix device_node refcount leak in i2c_pnx_probe()/i2c_pnx_remove() drivers/i2c/busses/i2c-cpm.c | 3 +++ drivers/i2c/busses/i2c-ibm_iic.c | 4 ++++ drivers/i2c/busses/i2c-mpc.c | 6 +++++- drivers/i2c/busses/i2c-opal.c | 6 +++++- drivers/i2c/busses/i2c-pnx.c | 15 ++++++++++++--- 5 files changed, 29 insertions(+), 5 deletions(-) -- 2.55.0 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 127FFC5B572 for ; 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Sat, 15 Aug 2026 11:12:29 -0700 (PDT) Received: from localhost.localdomain ([240a:4280:4800:6ace:25e8:2607:e94d:caaf]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-394eb7539d3sm7304254a91.15.2026.08.15.11.12.22 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sat, 15 Aug 2026 11:12:28 -0700 (PDT) From: Liu Zhenlong To: andi.shyti@kernel.org, chris.packham@alliedtelesis.co.nz, jochen@scram.de, maddy@linux.ibm.com, vz@mleia.com, piotr.wojtaszczyk@timesys.com Cc: mpe@ellerman.id.uk, npiggin@gmail.com, chleroy@kernel.org, grant.likely@secretlab.ca, neelegup@linux.vnet.ibm.com, benh@kernel.crashing.org, wsa@kernel.org, stigge@antcom.de, linux-i2c@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Liu Zhenlong , stable@vger.kernel.org Subject: [PATCH 0/5] i2c: fix device_node refcount leaks in 5 bus drivers Date: Sun, 16 Aug 2026 02:11:59 +0800 Message-ID: <20260815181204.2321-1-dragonliu2018@gmail.com> X-Mailer: git-send-email 2.55.0 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series fixes device_node refcount leaks in 5 i2c bus drivers that share the same bug pattern: adap->dev.of_node = of_node_get(pdev->dev.of_node); Each driver calls of_node_get() to take an extra reference on the platform device's of_node when assigning it to the adapter device, but none of them drop it in the probe error paths nor in the remove() callback. device_release() does not call of_node_put(), and i2c_adapter_dev_release() only completes a struct, so the extra reference is never released, leaking the device_node on every probe failure and every adapter removal. Additionally, in the remove() callbacks, i2c_del_adapter() clears adap->dev with memset() at the end (commit bd4bc3dbded9 ("i2c: Clear i2c_adapter.dev on adapter removal")), which zeroes adap->dev.of_node before of_node_put() runs, turning it into a no-op. The fix caches the pointer before calling i2c_del_adapter(), the same approach used in i2c-mux (i2c_mux_del_adapters) and mtd (commit 56570bdad5e3 ("mtd: core: Fix refcount error in del_mtd_device()")). A related fix for the i2c-qcom-cci driver has already been submitted separately: https://lore.kernel.org/linux-i2c/20260815140931.53297-1-dragonliu2018@gmail.com/ These 5 drivers are the remaining i2c bus drivers that use of_node_get() on the adapter device; all other drivers either assign of_node directly (without taking an extra reference) or don't use Device Tree at all. Each patch has its own Fixes: tag pointing to the commit that introduced of_node_get() in the respective driver, and requests stable backport via Cc: stable@vger.kernel.org. Compile-tested with gcc on arm64 defconfig using COMPILE_TEST; no hardware available for runtime testing. Liu Zhenlong (5): i2c: mpc: fix device_node refcount leak in fsl_i2c_probe()/fsl_i2c_remove() i2c: cpm: fix device_node refcount leak in cpm_i2c_probe()/cpm_i2c_remove() i2c: ibm_iic: fix device_node refcount leak in iic_probe()/iic_remove() i2c: opal: fix device_node refcount leak in i2c_opal_probe/remove() i2c: pnx: fix device_node refcount leak in i2c_pnx_probe()/i2c_pnx_remove() drivers/i2c/busses/i2c-cpm.c | 3 +++ drivers/i2c/busses/i2c-ibm_iic.c | 4 ++++ drivers/i2c/busses/i2c-mpc.c | 6 +++++- drivers/i2c/busses/i2c-opal.c | 6 +++++- drivers/i2c/busses/i2c-pnx.c | 15 ++++++++++++--- 5 files changed, 29 insertions(+), 5 deletions(-) -- 2.55.0