diff mbox series

[net-next] ethtool: ioctl: Use array_size() helper in copy_{from,to}_user()

Message ID 20210928195735.GA264809@embeddedor (mailing list archive)
State Accepted
Commit ed717613f972453ab924eee8b64a62e0db83be67
Delegated to: Netdev Maintainers
Headers show
Series [net-next] ethtool: ioctl: Use array_size() helper in copy_{from,to}_user() | expand

Checks

Context Check Description
netdev/cover_letter success Link
netdev/fixes_present success Link
netdev/patch_count success Link
netdev/tree_selection success Clearly marked for net-next
netdev/subject_prefix success Link
netdev/cc_maintainers warning 6 maintainers not CCed: moyufeng@huawei.com arnd@arndb.de danieller@nvidia.com andrew@lunn.ch hkallweit1@gmail.com irusskikh@marvell.com
netdev/source_inline success Was 0 now: 0
netdev/verify_signedoff success Link
netdev/module_param success Was 0 now: 0
netdev/build_32bit success Errors and warnings before: 1 this patch: 1
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/verify_fixes success Link
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 42 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 1 this patch: 1
netdev/header_inline success Link

Commit Message

Gustavo A. R. Silva Sept. 28, 2021, 7:57 p.m. UTC 
Use array_size() helper instead of the open-coded version in
copy_{from,to}_user().  These sorts of multiplication factors
need to be wrapped in array_size().

Link: https://github.com/KSPP/linux/issues/160
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 net/ethtool/ioctl.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 999e2a6bed13..bf6e8c2f9bf7 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -89,7 +89,8 @@  static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
 	if (copy_to_user(useraddr, &cmd, sizeof(cmd)))
 		return -EFAULT;
 	useraddr += sizeof(cmd);
-	if (copy_to_user(useraddr, features, copy_size * sizeof(*features)))
+	if (copy_to_user(useraddr, features,
+			 array_size(copy_size, sizeof(*features))))
 		return -EFAULT;
 
 	return 0;
@@ -799,7 +800,7 @@  static noinline_for_stack int ethtool_get_sset_info(struct net_device *dev,
 		goto out;
 
 	useraddr += offsetof(struct ethtool_sset_info, data);
-	if (copy_to_user(useraddr, info_buf, idx * sizeof(u32)))
+	if (copy_to_user(useraddr, info_buf, array_size(idx, sizeof(u32))))
 		goto out;
 
 	ret = 0;
@@ -1022,7 +1023,7 @@  static int ethtool_copy_validate_indir(u32 *indir, void __user *useraddr,
 {
 	int i;
 
-	if (copy_from_user(indir, useraddr, size * sizeof(indir[0])))
+	if (copy_from_user(indir, useraddr, array_size(size, sizeof(indir[0]))))
 		return -EFAULT;
 
 	/* Validate ring indices */
@@ -1895,7 +1896,7 @@  static int ethtool_self_test(struct net_device *dev, char __user *useraddr)
 	if (copy_to_user(useraddr, &test, sizeof(test)))
 		goto out;
 	useraddr += sizeof(test);
-	if (copy_to_user(useraddr, data, test.len * sizeof(u64)))
+	if (copy_to_user(useraddr, data, array_size(test.len, sizeof(u64))))
 		goto out;
 	ret = 0;
 
@@ -1937,7 +1938,8 @@  static int ethtool_get_strings(struct net_device *dev, void __user *useraddr)
 		goto out;
 	useraddr += sizeof(gstrings);
 	if (gstrings.len &&
-	    copy_to_user(useraddr, data, gstrings.len * ETH_GSTRING_LEN))
+	    copy_to_user(useraddr, data,
+			 array_size(gstrings.len, ETH_GSTRING_LEN)))
 		goto out;
 	ret = 0;