linux-kernel - [PATCH] spi: Fix reference count leak in slave

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Message-Id: <20250319032305.70340-1-linmq006@gmail.com>
Date: Wed, 19 Mar 2025 11:23:04 +0800
From: Miaoqian Lin <linmq006@...il.com>
To: Mark Brown <broonie@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: linmq006@...il.com
Subject: [PATCH] spi: Fix reference count leak in slave_show()

Fix a reference count leak in slave_show() by properly putting the device
reference obtained from device_find_any_child().

Fixes: 6c364062bfed ("spi: core: Add support for registering SPI slave controllers")
Fixes: c21b0837983d ("spi: Use device_find_any_child() instead of custom approach")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/spi/spi.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index a7a4647717d4..ff07c87dbadc 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2954,9 +2954,13 @@ static ssize_t slave_show(struct device *dev, struct device_attribute *attr,
 	struct spi_controller *ctlr = container_of(dev, struct spi_controller,
 						   dev);
 	struct device *child;
+	int ret;
 
 	child = device_find_any_child(&ctlr->dev);
-	return sysfs_emit(buf, "%s\n", child ? to_spi_device(child)->modalias : NULL);
+	ret = sysfs_emit(buf, "%s\n", child ? to_spi_device(child)->modalias : NULL);
+	put_device(child);
+
+	return ret;
 }
 
 static ssize_t slave_store(struct device *dev, struct device_attribute *attr,
-- 
2.39.5 (Apple Git-154)