diff options
| author | Alexander Usyskin <alexander.usyskin@intel.com> | 2020-10-29 11:54:43 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-11-03 10:12:58 +0100 |
| commit | c7a6252b9472fd96a3dbac40c891eb9f4fe5b4f1 (patch) | |
| tree | 6000a7b6e86d8437d092802a9b1230788213e032 /drivers/misc/mei/bus.c | |
| parent | a7c392c76a434c71df30ca748aae00d69684ff48 (diff) | |
mei: bus: do not start a read for disconnected clients
Avoid queuing reads and registering rx callbacks in
case the client is not connected, to prevent null
dereferencing and memory leaks.
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20201029095444.957924-3-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mei/bus.c')
| -rw-r--r-- | drivers/misc/mei/bus.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/misc/mei/bus.c b/drivers/misc/mei/bus.c index 9cdaa7f3af23..1a54bf3ed0c3 100644 --- a/drivers/misc/mei/bus.c +++ b/drivers/misc/mei/bus.c @@ -276,7 +276,8 @@ static void mei_cl_bus_rx_work(struct work_struct *work) cldev->rx_cb(cldev); mutex_lock(&bus->device_lock); - mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL); + if (mei_cl_is_connected(cldev->cl)) + mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL); mutex_unlock(&bus->device_lock); } @@ -364,7 +365,10 @@ int mei_cldev_register_rx_cb(struct mei_cl_device *cldev, mei_cldev_cb_t rx_cb) INIT_WORK(&cldev->rx_work, mei_cl_bus_rx_work); mutex_lock(&bus->device_lock); - ret = mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL); + if (mei_cl_is_connected(cldev->cl)) + ret = mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL); + else + ret = -ENODEV; mutex_unlock(&bus->device_lock); if (ret && ret != -EBUSY) return ret; |