From a34911f038f5591fdf115909eff494adde1606ce Mon Sep 17 00:00:00 2001 From: Phil Sutter Date: Mon, 2 Sep 2019 18:39:51 +0200 Subject: [PATCH] conntrack: Fix CIDR to mask conversion on Big Endian Code assumed host architecture to be Little Endian. Instead produce a proper mask by pushing the set bits into most significant position and apply htonl() on the result. Fixes: 3f6a2e90936bb ("conntrack: add support for CIDR notation") Signed-off-by: Phil Sutter Acked-by: Pablo Neira Ayuso (cherry picked from commit f27901afb038b07532b4c31cb77bbc0bd8068253) --- src/conntrack.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/conntrack.c b/src/conntrack.c index cbf03c7be8834..725e85d329c98 100644 --- a/src/conntrack.c +++ b/src/conntrack.c @@ -2175,7 +2175,7 @@ nfct_build_netmask(uint32_t *dst, int b, int n) dst[i] = 0xffffffff; b -= 32; } else if (b > 0) { - dst[i] = (1 << b) - 1; + dst[i] = htonl(~0u << (32 - b)); b = 0; } else { dst[i] = 0; -- 2.22.0