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ethtool: check the return value of get_regs_len

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The return type for get_regs_len in struct ethtool_ops is int,
the hns3 driver may return error when failing to get the regs
len by sending cmd to firmware.

Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yunsheng Lin 2018-12-26 19:51:46 +08:00 committed by David S. Miller
parent a3c9311f62
commit f9fc54d313
1 changed files with 10 additions and 2 deletions
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12
net/core/ethtool.c
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@ -793,8 +793,13 @@ static noinline_for_stack int ethtool_get_drvinfo(struct net_device *dev,
if (rc >= 0) if (rc >= 0)
info.n_priv_flags = rc; info.n_priv_flags = rc;
} }
if (ops->get_regs_len) if (ops->get_regs_len) {
info.regdump_len = ops->get_regs_len(dev); int ret = ops->get_regs_len(dev);
if (ret > 0)
info.regdump_len = ret;
}
if (ops->get_eeprom_len) if (ops->get_eeprom_len)
info.eedump_len = ops->get_eeprom_len(dev); info.eedump_len = ops->get_eeprom_len(dev);
@ -1337,6 +1342,9 @@ static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
return -EFAULT; return -EFAULT;
reglen = ops->get_regs_len(dev); reglen = ops->get_regs_len(dev);
if (reglen <= 0)
return reglen;
if (regs.len > reglen) if (regs.len > reglen)
regs.len = reglen; regs.len = reglen;