[patch] mailbox: Off by one in mbox_test_message_read()

[Dan Carpenter]

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@xxxxxxxxxx>
---
Btw, if we fill up the entire buffer then we don't copy the last NUL to
the user.

diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c
index 22f2e40..feff8fb 100644
--- a/drivers/mailbox/mailbox-test.c
+++ b/drivers/mailbox/mailbox-test.c
@@ -142,7 +142,7 @@ 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;
 
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