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authorKees Cook <keescook@chromium.org>2021-11-18 23:34:56 +0300
committerDavid S. Miller <davem@davemloft.net>2021-11-19 14:53:02 +0300
commit812ad3d270cb900d156a1542360d81f749dbe040 (patch)
tree4f752faa1681e2c04fab51614ab8d1f492820890 /net/ethtool
parentb5d8cf0af167f3ab9f4cfe44918cde01e20a1222 (diff)
downloadlinux-812ad3d270cb900d156a1542360d81f749dbe040.tar.xz
ethtool: stats: Use struct_group() to clear all stats at once
In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memset(), avoid intentionally writing across neighboring fields. Add struct_group() to mark region of struct stats_reply_data that should be initialized, which can now be done in a single memset() call. Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ethtool')
-rw-r--r--net/ethtool/stats.c15
1 files changed, 7 insertions, 8 deletions
diff --git a/net/ethtool/stats.c b/net/ethtool/stats.c
index ec07f5765e03..a20e0a24ff61 100644
--- a/net/ethtool/stats.c
+++ b/net/ethtool/stats.c
@@ -14,10 +14,12 @@ struct stats_req_info {
struct stats_reply_data {
struct ethnl_reply_data base;
- struct ethtool_eth_phy_stats phy_stats;
- struct ethtool_eth_mac_stats mac_stats;
- struct ethtool_eth_ctrl_stats ctrl_stats;
- struct ethtool_rmon_stats rmon_stats;
+ struct_group(stats,
+ struct ethtool_eth_phy_stats phy_stats;
+ struct ethtool_eth_mac_stats mac_stats;
+ struct ethtool_eth_ctrl_stats ctrl_stats;
+ struct ethtool_rmon_stats rmon_stats;
+ );
const struct ethtool_rmon_hist_range *rmon_ranges;
};
@@ -117,10 +119,7 @@ static int stats_prepare_data(const struct ethnl_req_info *req_base,
/* Mark all stats as unset (see ETHTOOL_STAT_NOT_SET) to prevent them
* from being reported to user space in case driver did not set them.
*/
- memset(&data->phy_stats, 0xff, sizeof(data->phy_stats));
- memset(&data->mac_stats, 0xff, sizeof(data->mac_stats));
- memset(&data->ctrl_stats, 0xff, sizeof(data->ctrl_stats));
- memset(&data->rmon_stats, 0xff, sizeof(data->rmon_stats));
+ memset(&data->stats, 0xff, sizeof(data->stats));
if (test_bit(ETHTOOL_STATS_ETH_PHY, req_info->stat_mask) &&
dev->ethtool_ops->get_eth_phy_stats)