* [PATCH] net: stmmac: dwmac-sun8i: Variable "val" in function sun8i_dwmac_set_syscon() could be uninitialized
@ 2019-08-31 2:00 Yizhuo
2019-09-02 18:48 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Yizhuo @ 2019-08-31 2:00 UTC (permalink / raw)
Cc: csong, zhiyunq, Yizhuo, Giuseppe Cavallaro, Alexandre Torgue,
Jose Abreu, David S. Miller, Maxime Ripard, Chen-Yu Tsai,
Maxime Coquelin, netdev, linux-arm-kernel, linux-stm32,
linux-kernel
In function sun8i_dwmac_set_syscon(), local variable "val" could
be uninitialized if function regmap_field_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 | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
index 4083019c547a..f97a4096f8fc 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
@@ -873,7 +873,12 @@ static int sun8i_dwmac_set_syscon(struct stmmac_priv *priv)
int ret;
u32 reg, val;
- regmap_field_read(gmac->regmap_field, &val);
+ ret = regmap_field_read(gmac->regmap_field, &val);
+ if (ret) {
+ dev_err(priv->device, "Fail to read from regmap field.\n");
+ return ret;
+ }
+
reg = gmac->variant->default_syscon_value;
if (reg != val)
dev_warn(priv->device,
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] net: stmmac: dwmac-sun8i: Variable "val" in function sun8i_dwmac_set_syscon() could be uninitialized
2019-08-31 2:00 [PATCH] net: stmmac: dwmac-sun8i: Variable "val" in function sun8i_dwmac_set_syscon() could be uninitialized Yizhuo
@ 2019-09-02 18:48 ` David Miller
0 siblings, 0 replies; 2+ messages in thread
From: David Miller @ 2019-09-02 18:48 UTC (permalink / raw)
To: yzhai003
Cc: csong, zhiyunq, peppe.cavallaro, alexandre.torgue, joabreu,
mripard, wens, mcoquelin.stm32, netdev, linux-arm-kernel,
linux-stm32, linux-kernel
From: Yizhuo <yzhai003@ucr.edu>
Date: Fri, 30 Aug 2019 19:00:48 -0700
> In function sun8i_dwmac_set_syscon(), local variable "val" could
> be uninitialized if function regmap_field_read() returns -EINVAL.
> However, it will be used directly in the if statement, which
> is potentially unsafe.
>
> Signed-off-by: Yizhuo <yzhai003@ucr.edu>
Applied, thank you.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2019-08-31 2:00 [PATCH] net: stmmac: dwmac-sun8i: Variable "val" in function sun8i_dwmac_set_syscon() could be uninitialized Yizhuo
2019-09-02 18:48 ` David Miller
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