linux-kernel - [PATCH net-next 3/4] macsec: fix memcpy with u64

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Message-ID: <20260120092137.2161162-4-mmyangfl@gmail.com>
Date: Tue, 20 Jan 2026 17:21:31 +0800
From: David Yang <mmyangfl@...il.com>
To: netdev@...r.kernel.org
Cc: David Yang <mmyangfl@...il.com>,
	Sabrina Dubroca <sd@...asysnail.net>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next 3/4] macsec: fix memcpy with u64_stats

On 64bit arches, struct u64_stats_sync is empty and provides no help
against load/store tearing. memcpy() should not be considered atomic
against u64 values. Use u64_stats_copy() instead.

Signed-off-by: David Yang <mmyangfl@...il.com>
---
 drivers/net/macsec.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 5200fd5a10e5..c2cb2d20976b 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -2806,7 +2806,7 @@ static void get_rx_sc_stats(struct net_device *dev,
 		stats = per_cpu_ptr(rx_sc->stats, cpu);
 		do {
 			start = u64_stats_fetch_begin(&stats->syncp);
-			memcpy(&tmp, &stats->stats, sizeof(tmp));
+			u64_stats_copy(&tmp, &stats->stats, sizeof(tmp));
 		} while (u64_stats_fetch_retry(&stats->syncp, start));
 
 		sum->InOctetsValidated += tmp.InOctetsValidated;
@@ -2887,7 +2887,7 @@ static void get_tx_sc_stats(struct net_device *dev,
 		stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
 		do {
 			start = u64_stats_fetch_begin(&stats->syncp);
-			memcpy(&tmp, &stats->stats, sizeof(tmp));
+			u64_stats_copy(&tmp, &stats->stats, sizeof(tmp));
 		} while (u64_stats_fetch_retry(&stats->syncp, start));
 
 		sum->OutPktsProtected   += tmp.OutPktsProtected;
@@ -2943,7 +2943,7 @@ static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
 		stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
 		do {
 			start = u64_stats_fetch_begin(&stats->syncp);
-			memcpy(&tmp, &stats->stats, sizeof(tmp));
+			u64_stats_copy(&tmp, &stats->stats, sizeof(tmp));
 		} while (u64_stats_fetch_retry(&stats->syncp, start));
 
 		sum->OutPktsUntagged  += tmp.OutPktsUntagged;
-- 
2.51.0