| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 107/140] usb: typec: fix use after free in typec_register_port() | Date | Mon, 16 Dec 2019 18:49:35 +0100 |
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From: Wen Yang <wenyang@linux.alibaba.com>
[ Upstream commit 5c388abefda0d92355714010c0199055c57ab6c7 ]
We can't use "port->sw" and/or "port->mux" after it has been freed.
Fixes: 23481121c81d ("usb: typec: class: Don't use port parent for getting mux handles") Signed-off-by: Wen Yang <wenyang@linux.alibaba.com> Cc: stable <stable@vger.kernel.org> Cc: linux-usb@vger.kernel.org Cc: linux-kernel@vger.kernel.org Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Link: https://lore.kernel.org/r/20191126140452.14048-1-wenyang@linux.alibaba.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/usb/typec/class.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c index 00141e05bc724..1916ee1600b47 100644 --- a/drivers/usb/typec/class.c +++ b/drivers/usb/typec/class.c @@ -1589,14 +1589,16 @@ struct typec_port *typec_register_port(struct device *parent, port->sw = typec_switch_get(&port->dev); if (IS_ERR(port->sw)) { + ret = PTR_ERR(port->sw); put_device(&port->dev); - return ERR_CAST(port->sw); + return ERR_PTR(ret); } port->mux = typec_mux_get(&port->dev, "typec-mux"); if (IS_ERR(port->mux)) { + ret = PTR_ERR(port->mux); put_device(&port->dev); - return ERR_CAST(port->mux); + return ERR_PTR(ret); } ret = device_add(&port->dev); -- 2.20.1
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