linux-kernel - [PATCH 4.19 287/639] bus: ti-sysc: Fix sysc_unprepare() when no clocks have been allocated

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Message-Id: <20200124093122.828644962@linuxfoundation.org>
Date:   Fri, 24 Jan 2020 10:27:37 +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, Tony Lindgren <tony@...mide.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 287/639] bus: ti-sysc: Fix sysc_unprepare() when no clocks have been allocated

From: Tony Lindgren <tony@...mide.com>

[ Upstream commit aaa29bb01cc4bf5a87dbdb219efba3b09f259d8e ]

If we return early before ddata->clocks have been allocated we will get a
NULL pointer dereference in sysc_unprepare(). Let's fix this by returning
early when no clocks are allocated.

Fixes: 0eecc636e5a2 ("bus: ti-sysc: Add minimal TI sysc interconnect target driver")
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/bus/ti-sysc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 2813f9ed57c0d..54c8c8644df2e 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -1400,6 +1400,9 @@ static void sysc_unprepare(struct sysc *ddata)
 {
 	int i;
 
+	if (!ddata->clocks)
+		return;
+
 	for (i = 0; i < SYSC_MAX_CLOCKS; i++) {
 		if (!IS_ERR_OR_NULL(ddata->clocks[i]))
 			clk_unprepare(ddata->clocks[i]);
-- 
2.20.1