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tcp: tcp_fragment() should apply sane memory limits
tcp: refine memory limit test in tcp_fragment()
References:
https://nvd.nist.gov/vuln/detail/CVE-2019-11478
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.9.y&id=e358f4af19db46ca25cc9a8a78412b09ba98859d
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.9.y&id=caa51edc7e9606418611e68de624efbd0042adf5
Change-Id: Ie16affeda488857ce013ce3be578c05619aee446
Signed-off-by: Andreas Wellving <andreas.wellving@enea.com>
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