linux-kernel - [PATCH] driver core: bus: Fix double free in driver API bus

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Message-Id: <20240727-bus_register_fix-v1-1-fed8dd0dba7a@quicinc.com>
Date: Sat, 27 Jul 2024 16:34:01 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Zijun Hu <zijun_hu@...oud.com>, linux-kernel@...r.kernel.org, 
 Zijun Hu <quic_zijuhu@...cinc.com>
Subject: [PATCH] driver core: bus: Fix double free in driver API
 bus_register()

From: Zijun Hu <quic_zijuhu@...cinc.com>

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@...cinc.com>
---
 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@...cinc.com>