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mei: fix NULL dereferencing during FW initiated disconnection

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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: <stable@vger.kernel.org> #4.2+
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 2016-04-17 12:16:03 -04:00 committed by Greg Kroah-Hartman
parent cc25aa94e4
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;
}