[PATCH] net: stmmac: Variable "val" in function sun8i_dwmac_set_syscon() could be uninitialized
From: Yizhuo <hidden>
Date: 2019-02-07 17:47:00
Also in:
lkml, netdev
Subsystem:
networking drivers, stmmac ethernet driver, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
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 <redacted> --- 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 39c2122a4f26..50cfd6d83052 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c@@ -641,7 +641,12 @@ static int sun8i_dwmac_set_syscon(struct stmmac_priv *priv) int ret; u32 reg, val; - regmap_read(gmac->regmap, SYSCON_EMAC_REG, &val); + ret = regmap_read(gmac->regmap, SYSCON_EMAC_REG, &val); + if (ret) { + dev_err(priv->device, "Fail to read SYSCON_EMAC_REG.\n"); + return ret; + } + reg = gmac->variant->default_syscon_value; if (reg != val) dev_warn(priv->device,
--
2.17.1
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