mei: mei_irq_thread_write_handler check for overflow

check for overflow when retrieving empty write slots

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 83e80bc08d77..8e4dd74b96e5 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -1204,6 +1204,9 @@ static int mei_irq_thread_write_handler(struct mei_io_list *cmpl_list,
                 return 0;
         }
         *slots = mei_count_empty_write_slots(dev);
+        if (*slots <= 0)
+                return -EMSGSIZE;
+
         /* complete all waiting for write CB */
         dev_dbg(&dev->pdev->dev, "complete all waiting for write cb.\n");