From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 22 Oct 2015 19:51:27 +0000 (+0300)
Subject: mailbox: Off by one in mbox_test_message_read()
X-Git-Tag: firefly_0821_release~176^2~767^2~1
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c3ac54a6f554475b034f87d471417bf0afcf3a42;p=firefly-linux-kernel-4.4.55.git

mailbox: Off by one in mbox_test_message_read()

We need to leave space for the NUL char.

Fixes: 8ea4484d0c2b ('mailbox: Add generic mechanism for testing Mailbox Controllers')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---

diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c
index a4f10cc4aea3..f82dc8926687 100644
--- a/drivers/mailbox/mailbox-test.c
+++ b/drivers/mailbox/mailbox-test.c
@@ -143,7 +143,7 @@ static ssize_t mbox_test_message_read(struct file *filp, char __user *userbuf,
 	int l = 0;
 	int ret;
 
-	touser = kzalloc(MBOX_HEXDUMP_MAX_LEN, GFP_KERNEL);
+	touser = kzalloc(MBOX_HEXDUMP_MAX_LEN + 1, GFP_KERNEL);
 	if (!touser)
 		return -ENOMEM;