[PATCH v2] edac: fix kobject refcount leak in edac_device_create_instance

[WenTao Liang]

kobject_get(&edac_dev->kobj) acquires a reference on main_kobj, but it is
only released when kobject_init_and_add fails. The success path and the
block-creation error path both return without calling
kobject_put(main_kobj), leaking the edac_dev kobject reference. The
main_kobj pointer is local and lost after function return.

Suggested-by: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
Fixes: bee33f22d7c3 ("clocksource/drivers/nxp-pit: Add NXP Automotive s32g2 / s32g3 support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: WenTao Liang <vulab@xxxxxxxxxxx>
---
Changes in v2:
- Fix patch format based on reviewer feedback
---
 drivers/edac/edac_device_sysfs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/edac/edac_device_sysfs.c b/drivers/edac/edac_device_sysfs.c
index b1c2717cd023..72b06d608b98 100644
--- a/drivers/edac/edac_device_sysfs.c
+++ b/drivers/edac/edac_device_sysfs.c
@@ -647,6 +647,7 @@ static int edac_device_create_instance(struct edac_device_ctl_info *edac_dev,
 
 	/* error unwind stack */
 err_release_instance_kobj:
+	kobject_put(main_kobj);
 	kobject_put(&instance->kobj);
 
 err_out:
-- 
2.39.5 (Apple Git-154)