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[ Upstream commit bcbc1b1de884647aa0318bf74eb7f293d72a1e40 ]
syzbot reported that udp->no_check6_rx can be read locklessly.
Use one atomic bit from udp->udp_flags.
Fixes: 1c19448c9b ("net: Make enabling of zero UDP6 csums more restrictive")
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>