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From: Felix Fietkau <nbd@nbd.name>
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Subject: netfilter: reduce match memory access
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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net/ipv4/netfilter/ip_tables.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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--- a/net/ipv4/netfilter/ip_tables.c
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+++ b/net/ipv4/netfilter/ip_tables.c
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@@ -56,9 +56,9 @@ ip_packet_match(const struct iphdr *ip,
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if (ipinfo->flags & IPT_F_NO_DEF_MATCH)
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return true;
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- if (NF_INVF(ipinfo, IPT_INV_SRCIP,
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+ if (NF_INVF(ipinfo, IPT_INV_SRCIP, ipinfo->smsk.s_addr &&
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(ip->saddr & ipinfo->smsk.s_addr) != ipinfo->src.s_addr) ||
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- NF_INVF(ipinfo, IPT_INV_DSTIP,
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+ NF_INVF(ipinfo, IPT_INV_DSTIP, ipinfo->dmsk.s_addr &&
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(ip->daddr & ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr))
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return false;
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