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ipv4: use RCU protection in __ip_rt_update_pmtu()
__ip_rt_update_pmtu() must use RCU protection to make sure the net structure it reads does not disappear. Fixes: 2fbc6e8 ("ipv4: Update exception handling for multipath routes via same device") Fixes: 1de6b15 ("Namespaceify min_pmtu sysctl") Signed-off-by: Eric Dumazet <edumazet@google.com> Link: https://patch.msgid.link/20250205155120.1676781-8-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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