From: Alexander Usyskin <alexander.usyskin@intel.com>
Date: Sun, 7 Feb 2016 21:35:21 +0000 (+0200)
Subject: mei: amthif: don't copy from an empty buffer
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5ba0bf476c792b91543da77e0bdec311b0eaa8f7;p=linux-beck.git

mei: amthif: don't copy from an empty buffer

If empty message come from FW (buf_idx == 0) then the current code will
still try to copy data from not filled buffer to the user-space,
instead the code should behave the same as when end of a message
has been reached, clean resources and return 0

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>
---

diff --git a/drivers/misc/mei/amthif.c b/drivers/misc/mei/amthif.c
index b753df98b476..c3f514027c80 100644
--- a/drivers/misc/mei/amthif.c
+++ b/drivers/misc/mei/amthif.c
@@ -185,7 +185,7 @@ int mei_amthif_read(struct mei_device *dev, struct file *file,
 	/* if the whole message will fit remove it from the list */
 	if (cb->buf_idx >= *offset && length >= (cb->buf_idx - *offset))
 		list_del_init(&cb->list);
-	else if (cb->buf_idx > 0 && cb->buf_idx <= *offset) {
+	else if (cb->buf_idx <= *offset) {
 		/* end of the message has been reached */
 		list_del_init(&cb->list);
 		rets = 0;