[PATCH] macintosh: therm_adt746x: fix memory leak on kthread failure

[Guangshuo Li]

probe_thermostat() allocates the thermostat state before creating the
monitoring kthread. If kthread_run() fails with -ENOMEM, the function
returns immediately without freeing the allocated state.

Since probe fails, remove_thermostat() will not be called, so the
allocation is leaked.

Free the thermostat state before returning from the kthread creation
failure path.

This issue was found by manual code inspection.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Guangshuo Li <lgs201920130244@xxxxxxxxx>
---
 drivers/macintosh/therm_adt746x.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/macintosh/therm_adt746x.c b/drivers/macintosh/therm_adt746x.c
index 1ac29a5cd324..60f292a5aa3b 100644
--- a/drivers/macintosh/therm_adt746x.c
+++ b/drivers/macintosh/therm_adt746x.c
@@ -557,6 +557,7 @@ static int probe_thermostat(struct i2c_client *client)
 	if (th->thread == ERR_PTR(-ENOMEM)) {
 		printk(KERN_INFO "adt746x: Kthread creation failed\n");
 		th->thread = NULL;
+		kfree(th);
 		return -ENOMEM;
 	}
 
-- 
2.43.0