linux-kernel - [PATCH 4.19 080/639] mailbox: ti-msgmgr: Off by one in ti_msgmgr_of

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Message-Id: <20200124093057.408055662@linuxfoundation.org>
Date:   Fri, 24 Jan 2020 10:24:10 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Nishanth Menon <nm@...com>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 080/639] mailbox: ti-msgmgr: Off by one in ti_msgmgr_of_xlate()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 78f3ff524fca63e7d2a57149a34ade23d2c12798 ]

The > comparison should be >= or we access one element beyond the end
of the array.

(The inst->qinsts[] array is allocated in the ti_msgmgr_probe() function
and it has ->num_valid_queues elements.)

Fixes: a2b79838b891 ("mailbox: ti-msgmgr: Add support for Secure Proxy")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Nishanth Menon <nm@...com>
Signed-off-by: Jassi Brar <jaswinder.singh@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/mailbox/ti-msgmgr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mailbox/ti-msgmgr.c b/drivers/mailbox/ti-msgmgr.c
index 5bceafbf66993..01e9e462512b7 100644
--- a/drivers/mailbox/ti-msgmgr.c
+++ b/drivers/mailbox/ti-msgmgr.c
@@ -547,7 +547,7 @@ static struct mbox_chan *ti_msgmgr_of_xlate(struct mbox_controller *mbox,
 	}
 
 	if (d->is_sproxy) {
-		if (req_pid > d->num_valid_queues)
+		if (req_pid >= d->num_valid_queues)
 			goto err;
 		qinst = &inst->qinsts[req_pid];
 		return qinst->chan;
-- 
2.20.1