[PATCH 6.12 284/567] i2c: amd-mp2: fix reference leak in MP2 PCI device

Greg Kroah-Hartman
2026-01-06T17:31:45Z

From: Ma Ke <make24@iscas.ac.cn>

commit a6ee6aac66fb394b7f6e6187c73bdcd873f2d139 upstream.

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: 529766e0a011 ("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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/i2c/busses/i2c-amd-mp2-pci.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/i2c/busses/i2c-amd-mp2-pci.c
+++ b/drivers/i2c/busses/i2c-amd-mp2-pci.c
@@ -461,13 +461,16 @@ struct amd_mp2_dev *amd_mp2_find_device(
{
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);