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mei: fix NULL dereferencing during FW initiated disconnection

Browse source 
In the case when disconnection is initiated from the FW
the driver is flushing items from the write control list while
iterating over it:

mei_irq_write_handler()
    list_for_each_entry_safe(ctrl_wr_list)         <-- outer loop
         mei_cl_irq_disconnect_rsp()
             mei_cl_set_disconnected()
                 mei_io_list_flush(ctrl_wr_list)   <-- destorying list

We move the list flushing to the completion routine.

Cc: <[email protected]> #4.2+
Signed-off-by: Alexander Usyskin <[email protected]>
Signed-off-by: Tomas Winkler <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Alexander Usyskin 2016-04-17 12:16:03 -04:00 • committed by Greg Kroah-Hartman
commit 6a8d648c8d
3 changed files with 6 additions and 6 deletions
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4
drivers/misc/mei/client.c
View file

@ -1766,6 +1766,10 @@ void mei_cl_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
if (waitqueue_active(&cl->wait))
wake_up(&cl->wait);
break;
case MEI_FOP_DISCONNECT_RSP:
mei_io_cb_free(cb);
mei_cl_set_disconnected(cl);
break;
default:
BUG_ON(0);

3
drivers/misc/mei/hbm.c
View file

@ -877,8 +877,7 @@ static int mei_hbm_fw_disconnect_req(struct mei_device *dev,
cb = mei_io_cb_init(cl, MEI_FOP_DISCONNECT_RSP, NULL);
if (!cb)
return -ENOMEM;
cl_dbg(dev, cl, "add disconnect response as first\n");
list_add(&cb->list, &dev->ctrl_wr_list.list);
list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
}
return 0;
}

5
drivers/misc/mei/interrupt.c
View file

@ -194,10 +194,7 @@ static int mei_cl_irq_disconnect_rsp(struct mei_cl *cl, struct mei_cl_cb *cb,
return -EMSGSIZE;
ret = mei_hbm_cl_disconnect_rsp(dev, cl);
mei_cl_set_disconnected(cl);
mei_io_cb_free(cb);
mei_me_cl_put(cl->me_cl);
cl->me_cl = NULL;
list_move_tail(&cb->list, &cmpl_list->list);
return ret;
}