From dd7fca9f49d3e7ab7e48d9c616bff0c84148a7e0 Mon Sep 17 00:00:00 2001 From: David Yang Date: Tue, 20 Jan 2026 17:21:30 +0800 Subject: [PATCH] net: bridge: mcast: 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 Reviewed-by: Ido Schimmel Link: https://patch.msgid.link/20260120092137.2161162-3-mmyangfl@gmail.com Signed-off-by: Jakub Kicinski --- net/bridge/br_multicast.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index d55a4ab87837f..dccae08b4f4c4 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -5201,7 +5201,7 @@ void br_multicast_get_stats(const struct net_bridge *br, do { start = u64_stats_fetch_begin(&cpu_stats->syncp); - memcpy(&temp, &cpu_stats->mstats, sizeof(temp)); + u64_stats_copy(&temp, &cpu_stats->mstats, sizeof(temp)); } while (u64_stats_fetch_retry(&cpu_stats->syncp, start)); mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries); -- 2.47.3