ethtool: check the return value of get_regs_len
commit f9fc54d313
upstream.
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>
Cc: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Родитель
badd8e3149
Коммит
9665d94ce3
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@ -890,8 +890,13 @@ static noinline_for_stack int ethtool_get_drvinfo(struct net_device *dev,
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if (rc >= 0)
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info.n_priv_flags = rc;
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}
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if (ops->get_regs_len)
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info.regdump_len = ops->get_regs_len(dev);
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if (ops->get_regs_len) {
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int ret = ops->get_regs_len(dev);
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if (ret > 0)
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info.regdump_len = ret;
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}
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if (ops->get_eeprom_len)
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info.eedump_len = ops->get_eeprom_len(dev);
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@ -1392,6 +1397,9 @@ static int ethtool_get_regs(struct net_device *dev, char __user *useraddr)
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return -EFAULT;
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reglen = ops->get_regs_len(dev);
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if (reglen <= 0)
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return reglen;
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if (regs.len > reglen)
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regs.len = reglen;
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