[PATCH net-next v2 5/7] macsec: fix memcpy with u64_stats
From: David Yang <mmyangfl@gmail.com>
Date: 2026-01-23 16:22:43
Also in:
lkml
Subsystem:
networking drivers, networking [macsec], the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Sabrina Dubroca, Linus Torvalds
On 64bit arches, struct u64_stats_sync is empty and provides no help against load/store tearing. memcpy() should not be considered tear-free. Use u64_stats_reads() instead. Signed-off-by: David Yang <mmyangfl@gmail.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..533a64713ea7 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_reads(&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_reads(&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_reads(&tmp, &stats->stats, sizeof(tmp)); } while (u64_stats_fetch_retry(&stats->syncp, start)); sum->OutPktsUntagged += tmp.OutPktsUntagged;
--
2.51.0