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ethtool: propagate get_coalesce return value 

get_coalesce returns 0 or ERRNO, but the return value isn't checked.
The returned coalesce data may be invalid if an ERRNO is set,
therefore better check and propagate the return value.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: hongrongxuan <hongrongxuan@huawei.com>
This commit is contained in:
Heiner Kallweit 2020-05-23 17:40:25 +02:00 committed by Jianping Liu
parent 6d524b1d96
commit cf7cbebb2b
1 changed files with 4 additions and 1 deletions
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5
net/ethtool/ioctl.c
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@ -1472,11 +1472,14 @@ static noinline_for_stack int ethtool_get_coalesce(struct net_device *dev,
void __user *useraddr)
{
struct ethtool_coalesce coalesce = { .cmd = ETHTOOL_GCOALESCE };
int ret;
if (!dev->ethtool_ops->get_coalesce)
return -EOPNOTSUPP;
dev->ethtool_ops->get_coalesce(dev, &coalesce);
ret = dev->ethtool_ops->get_coalesce(dev, &coalesce);
if (ret)
return ret;
if (copy_to_user(useraddr, &coalesce, sizeof(coalesce)))
return -EFAULT;