[PATCH 3/4] backports: fix events with extack backport

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The multicast group offset needs to be synced after registering the
family, otherwise multicast messages will use the wrong id

Signed-off-by: Felix Fietkau <nbd@xxxxxxxx>
 backport/compat/backport-4.12.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/backport/compat/backport-4.12.c b/backport/compat/backport-4.12.c
index f997b6c5..5e763084 100644
--- a/backport/compat/backport-4.12.c
+++ b/backport/compat/backport-4.12.c
@@ -224,6 +224,7 @@ int bp_extack_genl_register_family(struct genl_family *family)
 	/* copy this since the family might access it directly */
 	family->attrbuf = copy->family.attrbuf;
+	family->mcgrp_offset = copy->family.mcgrp_offset;
 	list_add_tail(&copy->list, &copies_list);

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