linux-kernel - [PATCH 4.14 159/173] clk: tegra: bpmp: Dont crash when a clock fails to register

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Date:   Mon, 24 Sep 2018 13:53:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Mikko Perttunen <mperttunen@...dia.com>,
        Jon Hunter <jonathanh@...dia.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 159/173] clk: tegra: bpmp: Dont crash when a clock fails to register

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mikko Perttunen <mperttunen@...dia.com>

[ Upstream commit f7b3182232c82bb9769e2d5471d702bae2972d2b ]

When registering clocks, we just skip any that fail to register
(leaving a NULL hole in the clock table). However, our of_xlate
function still tries to dereference each entry while looking for
the clock with the requested id, causing a crash if any clocks
failed to register. Add a check to of_xlate to skip any NULL
clocks.

Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
Acked-by: Jon Hunter <jonathanh@...dia.com>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/clk/tegra/clk-bpmp.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

--- a/drivers/clk/tegra/clk-bpmp.c
+++ b/drivers/clk/tegra/clk-bpmp.c
@@ -581,9 +581,15 @@ static struct clk_hw *tegra_bpmp_clk_of_
 	unsigned int id = clkspec->args[0], i;
 	struct tegra_bpmp *bpmp = data;
 
-	for (i = 0; i < bpmp->num_clocks; i++)
-		if (bpmp->clocks[i]->id == id)
-			return &bpmp->clocks[i]->hw;
+	for (i = 0; i < bpmp->num_clocks; i++) {
+		struct tegra_bpmp_clk *clk = bpmp->clocks[i];
+
+		if (!clk)
+			continue;
+
+		if (clk->id == id)
+			return &clk->hw;
+	}
 
 	return NULL;
 }