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Thu, 18 Jun 2026 07:37:36 -0700 (PDT) From: Uday Khare To: Andi Shyti Cc: Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Arnd Bergmann , Boris Brezillon , Maxime Ripard , Wolfram Sang , linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, Uday Khare Subject: [PATCH v3] i2c: sun6i-p2wi: Fix device node reference leak in p2wi_probe Date: Thu, 18 Jun 2026 20:07:27 +0530 Message-ID: <20260618143727.18534-1-udaykhare77@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-sunxi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Rspamd-Server: rspamd-worker-8404 X-Spamd-Result: default: False [0.34 / 15.00]; BAYES_HAM(-5.50)[100.00%]; RBL_SENDERSCORE(2.00)[104.64.211.4:from]; SUSPICIOUS_RECIPS(1.50)[]; MID_CONTAINS_FROM(1.00)[]; DMARC_POLICY_SOFTFAIL(1.00)[gmail.com : SPF not aligned (relaxed), No valid DKIM,none]; R_MISSING_CHARSET(0.50)[]; MAILLIST(-0.15)[generic]; 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This reference is never released, causing a device node reference leak. Fix this by calling of_node_put(childnp) on both the error and success paths. Fixes: 3e833490fae5 ("i2c: sunxi: add P2WI (Push/Pull 2 Wire Interface) controller support") Signed-off-by: Uday Khare --- v3: - Revert back to manual of_node_put() because the function uses goto-based error handling, and mixing the two styles is discouraged (reported by Sashiko-bot). v2: - Use __free(device_node) and include to automate the device node reference cleanup instead of manually calling of_node_put() on error and success paths (suggested by Chen-Yu Tsai). drivers/i2c/busses/i2c-sun6i-p2wi.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/busses/i2c-sun6i-p2wi.c b/drivers/i2c/busses/i2c-sun6i-p2wi.c index dffbe776a195..7c0239f8937e 100644 --- a/drivers/i2c/busses/i2c-sun6i-p2wi.c +++ b/drivers/i2c/busses/i2c-sun6i-p2wi.c @@ -184,7 +184,6 @@ static int p2wi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *np = dev->of_node; - struct device_node *childnp; unsigned long parent_clk_freq; u32 clk_freq = I2C_MAX_STANDARD_MODE_FREQ; struct p2wi *p2wi; @@ -217,14 +216,19 @@ static int p2wi_probe(struct platform_device *pdev) * In this case the target_addr is set to -1 and won't be checked when * launching a P2WI transfer. */ + struct device_node *childnp; + childnp = of_get_next_available_child(np, NULL); if (childnp) { ret = of_property_read_u32(childnp, "reg", &target_addr); - if (ret) + if (ret) { + of_node_put(childnp); return dev_err_probe(dev, -EINVAL, "invalid target address on node %pOF\n", childnp); + } p2wi->target_addr = target_addr; + of_node_put(childnp); } p2wi->regs = devm_platform_ioremap_resource(pdev, 0);