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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: 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 850f8940a6
commit 15c13dfcad
1 changed files with 9 additions and 0 deletions
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9
drivers/misc/mei/bus.c
View File

@ -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)