From: Austin Kim <austindh.kim@gmail.com>
To: davem@davemloft.net, kuba@kernel.org, gustavoars@kernel.org,
andrew@lunn.ch, bjorn@kernel.org
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
austin.kim@lge.com, austindh.kim@gmail.com
Subject: [PATCH] net: ethtool: clear heap allocations for ethtool function
Date: Wed, 9 Jun 2021 03:34:25 +0100 [thread overview]
Message-ID: <20210609023425.GA2024@raspberrypi> (raw)
Several ethtool functions leave heap uncleared (potentially) by
drivers. This will leave the unused portion of heap unchanged and
might copy the full contents back to userspace.
Signed-off-by: Austin Kim <austindh.kim@gmail.com>
---
net/ethtool/ioctl.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 3fa7a394eabf..baa5d10043cb 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -1421,7 +1421,7 @@ static int ethtool_get_any_eeprom(struct net_device *dev, void __user *useraddr,
if (eeprom.offset + eeprom.len > total_len)
return -EINVAL;
- data = kmalloc(PAGE_SIZE, GFP_USER);
+ data = kzalloc(PAGE_SIZE, GFP_USER);
if (!data)
return -ENOMEM;
@@ -1486,7 +1486,7 @@ static int ethtool_set_eeprom(struct net_device *dev, void __user *useraddr)
if (eeprom.offset + eeprom.len > ops->get_eeprom_len(dev))
return -EINVAL;
- data = kmalloc(PAGE_SIZE, GFP_USER);
+ data = kzalloc(PAGE_SIZE, GFP_USER);
if (!data)
return -ENOMEM;
@@ -1765,7 +1765,7 @@ static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
return -EFAULT;
test.len = test_len;
- data = kmalloc_array(test_len, sizeof(u64), GFP_USER);
+ data = kcalloc(test_len, sizeof(u64), GFP_USER);
if (!data)
return -ENOMEM;
@@ -2293,7 +2293,7 @@ static int ethtool_get_tunable(struct net_device *dev, void __user *useraddr)
ret = ethtool_tunable_valid(&tuna);
if (ret)
return ret;
- data = kmalloc(tuna.len, GFP_USER);
+ data = kzalloc(tuna.len, GFP_USER);
if (!data)
return -ENOMEM;
ret = ops->get_tunable(dev, &tuna, data);
@@ -2485,7 +2485,7 @@ static int get_phy_tunable(struct net_device *dev, void __user *useraddr)
ret = ethtool_phy_tunable_valid(&tuna);
if (ret)
return ret;
- data = kmalloc(tuna.len, GFP_USER);
+ data = kzalloc(tuna.len, GFP_USER);
if (!data)
return -ENOMEM;
if (phy_drv_tunable) {
--
2.20.1
next reply other threads:[~2021-06-09 2:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-09 2:34 Austin Kim [this message]
2021-06-09 21:00 ` [PATCH] net: ethtool: clear heap allocations for ethtool function patchwork-bot+netdevbpf
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