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 <xiyuyan...@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin....@gmail.com>
---
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 f24edc38c27b..b4aa8c2ba2c0 100644
--- a/drivers/staging/gasket/gasket_sysfs.c
+++ b/drivers/staging/gasket/gasket_sysfs.c
@@ -374,6 +374,7 @@ 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;
}
--
2.7.4
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