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| author | Yizhuo <yzhai003@ucr.edu> | 2019-10-01 23:24:39 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-10-03 00:20:22 +0300 |
| commit | 53de429f4e88f538f7a8ec2b18be8c0cd9b2c8e1 (patch) | |
| tree | 6c4b3dc78e76a49211dbaa32253af4a98e7fc2e3 /drivers/net/ethernet/hisilicon/hns_mdio.c | |
| parent | 4fbb97bac1be4fb5a4b8030e2b247b81504fe694 (diff) | |
| download | linux-53de429f4e88f538f7a8ec2b18be8c0cd9b2c8e1.tar.xz | |
net: hisilicon: Fix usage of uninitialized variable in function mdio_sc_cfg_reg_write()
In function mdio_sc_cfg_reg_write(), variable "reg_value" could be
uninitialized if regmap_read() fails. However, "reg_value" is used
to decide the control flow later in the if statement, which is
potentially unsafe.
Signed-off-by: Yizhuo <yzhai003@ucr.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/hisilicon/hns_mdio.c')
| -rw-r--r-- | drivers/net/ethernet/hisilicon/hns_mdio.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/net/ethernet/hisilicon/hns_mdio.c b/drivers/net/ethernet/hisilicon/hns_mdio.c index 3e863a71c513..7df5d7d211d4 100644 --- a/drivers/net/ethernet/hisilicon/hns_mdio.c +++ b/drivers/net/ethernet/hisilicon/hns_mdio.c @@ -148,11 +148,15 @@ static int mdio_sc_cfg_reg_write(struct hns_mdio_device *mdio_dev, { u32 time_cnt; u32 reg_value; + int ret; regmap_write(mdio_dev->subctrl_vbase, cfg_reg, set_val); for (time_cnt = MDIO_TIMEOUT; time_cnt; time_cnt--) { - regmap_read(mdio_dev->subctrl_vbase, st_reg, ®_value); + ret = regmap_read(mdio_dev->subctrl_vbase, st_reg, ®_value); + if (ret) + return ret; + reg_value &= st_msk; if ((!!check_st) == (!!reg_value)) break; |