[char-misc-next 3/4] mei: mei_irq_thread_write_handler check for overflow

[Tomas Winkler]

check for overflow when retrieving empty write slots

Change-Id: Icdbe6c671686e55c322de66901dada365a3ea105
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
---
 drivers/misc/mei/interrupt.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 86380fd..7ea0254 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");
 
-- 
1.7.4.4

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