[PATCH AUTOSEL 4.19 063/172] staging: gasket: Fix mapping refcnt leak when register/store fails

Sasha Levin
2020-06-18T02:03:01Z

From: Xiyu Yang <xiyuyang19@fudan.edu.cn>

[ Upstream commit e3436ce60cf5f5eaedda2b8c622f69feb97595e2 ]

gasket_sysfs_register_store() invokes get_mapping(), which returns a
reference of the specified gasket_sysfs_mapping object to "mapping" with
increased refcnt.

When gasket_sysfs_register_store() returns, local variable "mapping"
becomes invalid, so the refcount should be decreased to keep refcount
balanced.

The reference counting issue happens in one exception handling path of
gasket_sysfs_register_store(). When gasket_dev is NULL, the function
forgets to decrease the refcnt increased by get_mapping(), causing a
refcnt leak.

Fix this issue by calling put_mapping() when gasket_dev is NULL.

Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Link: https://lore.kernel.org/r/1587618941-13718-1-git-send-email-xiyuyang19@fudan.edu.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/staging/gasket/gasket_sysfs.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/staging/gasket/gasket_sysfs.c b/drivers/staging/gasket/gasket_sysfs.c
index 9c982f1c0881..5986c67bc7ec 100644
--- a/drivers/staging/gasket/gasket_sysfs.c
+++ b/drivers/staging/gasket/gasket_sysfs.c
@@ -377,6 +377,7 @@ ssize_t gasket_sysfs_register_store(struct device *device,
gasket_dev = mapping->gasket_dev;
if (!gasket_dev) {
dev_err(device, "Device driver may have been removed\n");
+ put_mapping(mapping);
return 0;
}

--
2.25.1