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[ Upstream commit469308552c] ip4_dst_hoplimit() must use RCU protection to make sure the net structure it reads does not disappear. Fixes:fa50d974d1("ipv4: Namespaceify ip_default_ttl sysctl knob") Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com> Link: https://patch.msgid.link/20250205155120.1676781-3-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>