Re: [PATCH net v3 4/4] net: ipv6: Clamp to IP6_MAX_MTU in ip6_dst_mtu_maybe_forward

Willem de Bruijn <[email protected]>
Newsgroups org.kernel.vger.netdev
Message-ID <[email protected]> 
Alice Mikityanska wrote:
> From: Alice Mikityanska <[email protected]>
> 
> 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 <[email protected]>
> Suggested-by: Willem de Bruijn <[email protected]>

Reviewed-by: Willem de Bruijn <[email protected]>
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