linux-kernel - [PATCH] clk: fix possible null pointer dereference

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Message-Id: <1420473863-30696-1-git-send-email-svarbanov@mm-sol.com>
Date:	Mon,  5 Jan 2015 18:04:23 +0200
From:	Stanimir Varbanov <svarbanov@...sol.com>
To:	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Stanimir Varbanov <svarbanov@...sol.com>
Subject: [PATCH] clk: fix possible null pointer dereference

The commit 646cafc6 (clk: Change clk_ops->determine_rate to
return a clk_hw as the best parent) opens a possibility for
null pointer dereference, fix this.

Signed-off-by: Stanimir Varbanov <svarbanov@...sol.com>
---
 drivers/clk/clk.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index f4963b7..d48ac71 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1366,7 +1366,7 @@ static struct clk *clk_calc_new_rates(struct clk *clk, unsigned long rate)
 		new_rate = clk->ops->determine_rate(clk->hw, rate,
 						    &best_parent_rate,
 						    &parent_hw);
-		parent = parent_hw->clk;
+		parent = parent_hw ? parent_hw->clk : NULL;
 	} else if (clk->ops->round_rate) {
 		new_rate = clk->ops->round_rate(clk->hw, rate,
 						&best_parent_rate);
-- 
1.7.0.4

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