netfilter: nf_conntrack_sip: CSeq 0 is a valid CSeq
Do not drop packet when CSeq is 0 as 0 is also a valid value for CSeq. simple_strtoul() will return 0 either when all digits are 0 or if there are no digits at all. Therefore when simple_strtoul() returns 0 we check if first character is digit 0 or not. Signed-off-by: NChristophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>
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