ipv6: do not warn on route notification size race

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fib6_info_hw_flags_set() sizes the skb with rt6_nlmsg_size() and later
fills it with rt6_fill_node().  With nexthop compatibility mode enabled,
a concurrent replacement can grow the group between these independent
snapshots.  rt6_fill_node() can then legitimately return -EMSGSIZE, so
the warning does not prove a sizing bug.

Remove the warning.  The existing error path still frees the skb and
reports the error to listeners.

Fixes: 907eea4868 ("net: ipv6: Emit notification when fib hardware flags are changed")
Reported-by: Ido Schimmel <idosch@nvidia.com>
Link: https://lore.kernel.org/netdev/20261007114003.GA1011260@shredder/
Suggested-by: Ido Schimmel <idosch@nvidia.com>
Cc: stable@vger.kernel.org
Signed-off-by: Daehyeon Ko <4ncienth@gmail.com>
Link: https://patch.msgid.link/4012604727e5ba80b69ccd4d08796511397ddaef.1791423190.git.4ncienth@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Daehyeon Ko 2026-10-08 14:29:23 +09:00 • committed by Jakub Kicinski

parent e02a5b6588

commit c97426ec64

1 changed files with 0 additions and 2 deletions

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net/ipv6/route.c

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