The branch stable/12 has been updated by donner:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=63312dd6d12992d7e8c10bcd41389d5a25192f8f

commit 63312dd6d12992d7e8c10bcd41389d5a25192f8f
Author:     Lutz Donnerhacke <[email protected]>
AuthorDate: 2021-06-13 22:00:35 +0000
Commit:     Lutz Donnerhacke <[email protected]>
CommitDate: 2021-06-16 21:58:59 +0000

    netgraph/bridge: malloc without flags
    
    During tests an assert was triggered and pointed to missing flags in
    the newlink function of ng_bridge(4).
    
    Reported by:    markj
    Reviewed by:    markj
    Differential Revision: https://reviews.freebsd.org/D30759
    
    (cherry picked from commit 4c3280e58727e900d4c217054fe655e3512380f1)
---
 sys/netgraph/ng_bridge.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/sys/netgraph/ng_bridge.c b/sys/netgraph/ng_bridge.c
index 5a8c1731aa3f..1a0840341020 100644
--- a/sys/netgraph/ng_bridge.c
+++ b/sys/netgraph/ng_bridge.c
@@ -395,9 +395,7 @@ ng_bridge_newhook(node_p node, hook_p hook, const char 
*name)
        if(NG_PEER_NODE(hook) == node)
                return (ELOOP);
 
-       link = malloc(sizeof(*link), M_NETGRAPH_BRIDGE, M_ZERO);
-       if (link == NULL)
-               return (ENOMEM);
+       link = malloc(sizeof(*link), M_NETGRAPH_BRIDGE, M_WAITOK | M_ZERO);
 
        link->stats.recvOctets = counter_u64_alloc(M_WAITOK);
        link->stats.recvPackets = counter_u64_alloc(M_WAITOK);
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