i2c: amd-mp2: fix reference leak in MP2 PCI device

In i2c_amd_probe(), amd_mp2_find_device() utilizes
driver_find_next_device() which internally calls driver_find_device()
to locate the matching device. driver_find_device() increments the
reference count of the found device by calling get_device(), but
amd_mp2_find_device() fails to call put_device() to decrement the
reference count before returning. This results in a reference count
leak of the PCI device each time i2c_amd_probe() is executed, which
may prevent the device from being properly released and cause a memory
leak.

Found by code review.

Cc: stable@vger.kernel.org
Fixes: 529766e ("i2c: Add drivers for the AMD PCIe MP2 I2C controller")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20251022095402.8846-1-make24@iscas.ac.cn

Author: Ma Ke

drivers/i2c/busses/i2c-amd-mp2-pci.c

@@ -458,13 +458,16 @@ struct amd_mp2_dev *amd_mp2_find_device(void)
 {
 	struct device *dev;
 	struct pci_dev *pci_dev;
+	struct amd_mp2_dev *mp2_dev;
 
 	dev = driver_find_next_device(&amd_mp2_pci_driver.driver, NULL);
 	if (!dev)
 		return NULL;
 
 	pci_dev = to_pci_dev(dev);
-	return (struct amd_mp2_dev *)pci_get_drvdata(pci_dev);
+	mp2_dev = (struct amd_mp2_dev *)pci_get_drvdata(pci_dev);
+	put_device(dev);
+	return mp2_dev;
 }
 EXPORT_SYMBOL_GPL(amd_mp2_find_device);