linux-kernel - [PATCH] clk: rockchip: Fix static checker warning in rockchip_ddrclk_get

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20181016134144.12461-1-enric.balletbo@collabora.com>
Date:   Tue, 16 Oct 2018 15:41:44 +0200
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     linux-kernel@...r.kernel.org
Cc:     kernel@...labora.com, Michael Turquette <mturquette@...libre.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-rockchip@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] clk: rockchip: Fix static checker warning in rockchip_ddrclk_get_parent call

Fixes the signedness bug returning '(-22)' on the return type by removing the
sanity checker in rockchip_ddrclk_get_parent(). The function should return
and unsigned value only and it's safe to remove the sanity checker as the
core functions that call get_parent like clk_core_get_parent_by_index already
ensures the validity of the clk index returned (index >= core->num_parents).

Fixes: a4f182bf81f18 ("clk: rockchip: add new clock-type for the ddrclk")
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
---

 drivers/clk/rockchip/clk-ddr.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/clk/rockchip/clk-ddr.c b/drivers/clk/rockchip/clk-ddr.c
index de00590af167..fd5c90371dbf 100644
--- a/drivers/clk/rockchip/clk-ddr.c
+++ b/drivers/clk/rockchip/clk-ddr.c
@@ -185,16 +185,12 @@ rockchip_ddrclk_sip_recalc_rate(struct clk_hw *hw,
 static u8 rockchip_ddrclk_get_parent(struct clk_hw *hw)
 {
 	struct rockchip_ddrclk *ddrclk = to_rockchip_ddrclk_hw(hw);
-	int num_parents = clk_hw_get_num_parents(hw);
 	u32 val;
 
 	val = clk_readl(ddrclk->reg_base +
 			ddrclk->mux_offset) >> ddrclk->mux_shift;
 	val &= GENMASK(ddrclk->mux_width - 1, 0);
 
-	if (val >= num_parents)
-		return -EINVAL;
-
 	return val;
 }
 
-- 
2.19.1