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Subject[PATCH][next] ethtool: ioctl: Use array_size() in copy_to_user()
Use array_size() helper instead of the open-coded version in
copy_to_user(). These sorts of multiplication factors need to
be wrapped in array_size().

This issue was found with the help of Coccinelle and, audited and fixed
manually.

Addresses-KSPP-ID: https://github.com/KSPP/linux/issues/83
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
net/ethtool/ioctl.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index b5df90c981c2..be3ed24bfe03 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -1918,7 +1918,7 @@ static int ethtool_get_stats(struct net_device *dev, void __user *useraddr)
if (copy_to_user(useraddr, &stats, sizeof(stats)))
goto out;
useraddr += sizeof(stats);
- if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
+ if (n_stats && copy_to_user(useraddr, data, array_size(n_stats, sizeof(u64))))
goto out;
ret = 0;

@@ -1973,7 +1973,7 @@ static int ethtool_get_phy_stats(struct net_device *dev, void __user *useraddr)
if (copy_to_user(useraddr, &stats, sizeof(stats)))
goto out;
useraddr += sizeof(stats);
- if (n_stats && copy_to_user(useraddr, data, n_stats * sizeof(u64)))
+ if (n_stats && copy_to_user(useraddr, data, array_size(n_stats, sizeof(u64))))
goto out;
ret = 0;

--
2.27.0
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