[PATCH] driver core: bus: Fix double free in driver API bus_register()

[Zijun Hu]

From: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>

For bus_register(), any error which happens after kset_register() will
cause that @priv are freed twice, fixed by setting @priv with NULL after
the first free.

Signed-off-by: Zijun Hu <quic_zijuhu@xxxxxxxxxxx>
---
 drivers/base/bus.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index ffea0728b8b2..08362ecec0ec 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -920,6 +920,8 @@ int bus_register(const struct bus_type *bus)
 	bus_remove_file(bus, &bus_attr_uevent);
 bus_uevent_fail:
 	kset_unregister(&priv->subsys);
+	/* Above kset_unregister() will kfree @priv */
+	priv = NULL;
 out:
 	kfree(priv);
 	return retval;

---
base-commit: 1722389b0d863056d78287a120a1d6cadb8d4f7b
change-id: 20240727-bus_register_fix-4451ccf01707

Best regards,
-- 
Zijun Hu <quic_zijuhu@xxxxxxxxxxx>