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Commit 15c13dfc authored by Alexander Usyskin's avatar Alexander Usyskin Committed by Greg Kroah-Hartman
Browse files

mei: bus: check if the device is enabled before data transfer 



The bus data transfer interface was missing the check if the device is
in enabled state, this may lead to stack corruption during link reset.

Cc: <stable@vger.kernel.org> #4.0
Signed-off-by: default avatarAlexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 850f8940

drivers/misc/mei/bus.c

+9 −0
Original line number Diff line number Diff line
@@ -53,6 +53,11 @@ ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, 
	bus = cl->dev;



	mutex_lock(&bus->device_lock);

	if (bus->dev_state != MEI_DEV_ENABLED) {

		rets = -ENODEV;

		goto out;

	}



	if (!mei_cl_is_connected(cl)) {

		rets = -ENODEV;

		goto out;
@@ -109,6 +114,10 @@ ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length) 
	bus = cl->dev;



	mutex_lock(&bus->device_lock);

	if (bus->dev_state != MEI_DEV_ENABLED) {

		rets = -ENODEV;

		goto out;

	}



	cb = mei_cl_read_cb(cl, NULL);

	if (cb)