From: Yizhuo <yzhai003@ucr.edu>
To: unlisted-recipients:; (no To-header on input)
Cc: csong@cs.ucr.edu, zhiyunq@cs.ucr.edu, Yizhuo <yzhai003@ucr.edu>,
Giuseppe Cavallaro <peppe.cavallaro@st.com>,
Alexandre Torgue <alexandre.torgue@st.com>,
Maxime Ripard <maxime.ripard@free-electrons.com>,
Chen-Yu Tsai <wens@csie.org>,
netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] net: stmmac: Variable "val" in function sun8i_dwmac_set_syscon() could be uninitialized
Date: Tue, 5 Feb 2019 14:15:59 -0800 [thread overview]
Message-ID: <20190205221559.17545-1-yzhai003@ucr.edu> (raw)
In function sun8i_dwmac_set_syscon(), local variable "val" could
be uninitialized if function regmap_read() returns -EINVAL.
However, it will be used directly in the if statement, which
is potentially unsafe.
Signed-off-by: Yizhuo <yzhai003@ucr.edu>
---
drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
index 39c2122a4f26..11d481c9e7ab 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
@@ -639,9 +639,14 @@ static int sun8i_dwmac_set_syscon(struct stmmac_priv *priv)
struct sunxi_priv_data *gmac = priv->plat->bsp_priv;
struct device_node *node = priv->device->of_node;
int ret;
- u32 reg, val;
+ u32 reg, val = 0;
+
+ ret = regmap_read(gmac->regmap, SYSCON_EMAC_REG, &val);
+ if (ret) {
+ dev_err(priv->device, "Fail to read SYSCON_EMAC_REG.\n");
+ return ret;
+ }
- regmap_read(gmac->regmap, SYSCON_EMAC_REG, &val);
reg = gmac->variant->default_syscon_value;
if (reg != val)
dev_warn(priv->device,
--
2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Yizhuo <yzhai003@ucr.edu>
Cc: csong@cs.ucr.edu, Alexandre Torgue <alexandre.torgue@st.com>,
netdev@vger.kernel.org, zhiyunq@cs.ucr.edu,
linux-kernel@vger.kernel.org, Yizhuo <yzhai003@ucr.edu>,
Chen-Yu Tsai <wens@csie.org>,
Giuseppe Cavallaro <peppe.cavallaro@st.com>,
Maxime Ripard <maxime.ripard@free-electrons.com>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH] net: stmmac: Variable "val" in function sun8i_dwmac_set_syscon() could be uninitialized
Date: Tue, 5 Feb 2019 14:15:59 -0800 [thread overview]
Message-ID: <20190205221559.17545-1-yzhai003@ucr.edu> (raw)
In function sun8i_dwmac_set_syscon(), local variable "val" could
be uninitialized if function regmap_read() returns -EINVAL.
However, it will be used directly in the if statement, which
is potentially unsafe.
Signed-off-by: Yizhuo <yzhai003@ucr.edu>
---
drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
index 39c2122a4f26..11d481c9e7ab 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
@@ -639,9 +639,14 @@ static int sun8i_dwmac_set_syscon(struct stmmac_priv *priv)
struct sunxi_priv_data *gmac = priv->plat->bsp_priv;
struct device_node *node = priv->device->of_node;
int ret;
- u32 reg, val;
+ u32 reg, val = 0;
+
+ ret = regmap_read(gmac->regmap, SYSCON_EMAC_REG, &val);
+ if (ret) {
+ dev_err(priv->device, "Fail to read SYSCON_EMAC_REG.\n");
+ return ret;
+ }
- regmap_read(gmac->regmap, SYSCON_EMAC_REG, &val);
reg = gmac->variant->default_syscon_value;
if (reg != val)
dev_warn(priv->device,
--
2.17.1
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next reply other threads:[~2019-02-05 22:16 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-05 22:15 Yizhuo [this message]
2019-02-05 22:15 ` [PATCH] net: stmmac: Variable "val" in function sun8i_dwmac_set_syscon() could be uninitialized Yizhuo
2019-02-06 9:18 ` Maxime Ripard
2019-02-06 9:18 ` Maxime Ripard
2019-02-07 4:17 ` David Miller
2019-02-07 4:17 ` David Miller
[not found] ` <CABvMjLQ6MYtGYeLxwceZsvcyn4oScgMo+BGQMHw7SkZ1uxFmHQ@mail.gmail.com>
2019-02-07 5:53 ` Yizhuo Zhai
2019-02-07 5:53 ` Yizhuo Zhai
2019-02-07 9:24 ` Maxime Ripard
2019-02-07 9:24 ` Maxime Ripard
2019-02-07 17:48 ` Yizhuo Zhai
2019-02-07 17:48 ` Yizhuo Zhai
2019-02-07 17:53 ` David Miller
2019-02-07 17:53 ` David Miller
2019-02-07 17:46 Yizhuo
2019-02-07 17:46 ` Yizhuo
2019-02-08 7:44 ` Maxime Ripard
2019-02-08 7:44 ` Maxime Ripard
2019-02-09 7:01 ` David Miller
2019-02-09 7:01 ` David Miller
2019-08-30 22:29 ` Yizhuo Zhai
2019-08-30 22:29 ` Yizhuo Zhai
2019-08-31 0:37 ` David Miller
2019-08-31 0:37 ` David Miller
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