From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
To: Alice Mikityanska <alice.kernel@fastmail.im>,
Willem de Bruijn <willemdebruijn.kernel@gmail.com>,
David Ahern <dsahern@kernel.org>,
Ido Schimmel <idosch@nvidia.com>,
Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>
Cc: "David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Simon Horman <horms@kernel.org>, Shuah Khan <shuah@kernel.org>,
Hannes Frederic Sowa <hannes@stressinduktion.org>,
Vadim Fedorenko <vadim.fedorenko@linux.dev>,
netdev@vger.kernel.org, Alice Mikityanska <alice@isovalent.com>
Subject: Re: [PATCH net v3 4/4] net: ipv6: Clamp to IP6_MAX_MTU in ip6_dst_mtu_maybe_forward
Date: Sat, 22 Aug 2026 14:41:34 -0400 [thread overview]
Message-ID: <willemdebruijn.kernel.28e276abec867@gmail.com> (raw)
In-Reply-To: <20260822115717.1161782-5-alice.kernel@fastmail.im>
Alice Mikityanska wrote:
> From: Alice Mikityanska <alice@isovalent.com>
>
> Commit 427faee167bc ("net: ipv6: introduce ip6_dst_mtu_maybe_forward")
> dropped the IP6_MAX_MTU clamp that used to be present in ip6_mtu(). A
> similar IPv4 commit ac6627a28dbf ("net: ipv4: Consolidate ipv4_mtu and
> ip_dst_mtu_maybe_forward") preserves the IP_MAX_MTU clamp.
>
> Restore the upper bound in the IPv6 flow to avoid potential 16-bit
> overflows in forwarding paths.
>
> Fixes: 427faee167bc ("net: ipv6: introduce ip6_dst_mtu_maybe_forward")
> Signed-off-by: Alice Mikityanska <alice@isovalent.com>
> Suggested-by: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
prev parent reply other threads:[~2026-08-22 18:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-22 11:57 [PATCH net v3 0/4] Fix UDP length overflow in edge cases Alice Mikityanska
2026-08-22 11:57 ` [PATCH net v3 1/4] net: ipv4: Fix UDP length overflow with PMTU discover and big MTU Alice Mikityanska
2026-08-22 18:35 ` Willem de Bruijn
2026-08-22 11:57 ` [PATCH net v3 2/4] net: ipv6: " Alice Mikityanska
2026-08-22 18:39 ` Willem de Bruijn
2026-08-22 11:57 ` [PATCH net v3 3/4] selftests: net: Test " Alice Mikityanska
2026-08-22 18:50 ` Willem de Bruijn
2026-08-25 23:13 ` Alice Mikityanska
2026-08-22 11:57 ` [PATCH net v3 4/4] net: ipv6: Clamp to IP6_MAX_MTU in ip6_dst_mtu_maybe_forward Alice Mikityanska
2026-08-22 18:41 ` Willem de Bruijn [this message]
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