linux-kernel - [PATCH 5.4 270/408] clk: rockchip: Initialize hw to error to avoid undefined behavior

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Date:   Tue, 27 Oct 2020 14:53:28 +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, Elaine Zhang <zhangqing@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Stephen Boyd <sboyd@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 270/408] clk: rockchip: Initialize hw to error to avoid undefined behavior

From: Stephen Boyd <sboyd@...nel.org>

[ Upstream commit b608f11d49ec671739604cc763248d8e8fadbbeb ]

We can get down to this return value from ERR_CAST() without
initializing hw. Set it to -ENOMEM so that we always return something
sane.

Fixes the following smatch warning:

drivers/clk/rockchip/clk-half-divider.c:228 rockchip_clk_register_halfdiv() error: uninitialized symbol 'hw'.
drivers/clk/rockchip/clk-half-divider.c:228 rockchip_clk_register_halfdiv() warn: passing zero to 'ERR_CAST'

Cc: Elaine Zhang <zhangqing@...k-chips.com>
Cc: Heiko Stuebner <heiko@...ech.de>
Fixes: 956060a52795 ("clk: rockchip: add support for half divider")
Reviewed-by: Heiko Stuebner <heiko@...ech.de>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/rockchip/clk-half-divider.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/rockchip/clk-half-divider.c b/drivers/clk/rockchip/clk-half-divider.c
index ba9f00dc9740c..7dd2e0b1a5866 100644
--- a/drivers/clk/rockchip/clk-half-divider.c
+++ b/drivers/clk/rockchip/clk-half-divider.c
@@ -167,7 +167,7 @@ struct clk *rockchip_clk_register_halfdiv(const char *name,
 					  unsigned long flags,
 					  spinlock_t *lock)
 {
-	struct clk *clk;
+	struct clk *clk = ERR_PTR(-ENOMEM);
 	struct clk_mux *mux = NULL;
 	struct clk_gate *gate = NULL;
 	struct clk_divider *div = NULL;
-- 
2.25.1