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

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commit 15c13dfcad upstream.

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.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Usyskin 2016-02-07 23:35:32 +02:00 committed by Greg Kroah-Hartman
parent 499f9ff872
commit fa0ae4f223
1 changed files with 9 additions and 0 deletions
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9
drivers/misc/mei/bus.c
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@ -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)