netfilter: nf_nat_snmp: fix checksum calculation (v4)

[net-next-2.6.git] / net / ipv4 / netfilter / nf_nat_snmp_basic.c

diff --git a/net/ipv4/netfilter/nf_nat_snmp_basic.c b/net/ipv4/netfilter/nf_nat_snmp_basic.c
index 1679e2c0963d9b83e34f1f8d6a34b7702a603e2c..ee5f419d0a56d01c6533d6ee45f70a7405480150 100644 (file)
--- a/net/ipv4/netfilter/nf_nat_snmp_basic.c
+++ b/net/ipv4/netfilter/nf_nat_snmp_basic.c
@@ -893,13 +893,15 @@ static void fast_csum(__sum16 *csum,
        unsigned char s[4];
 
        if (offset & 1) {
-               s[0] = s[2] = 0;
+               s[0] = ~0;
                s[1] = ~*optr;
+               s[2] = 0;
                s[3] = *nptr;
        } else {
-               s[1] = s[3] = 0;
                s[0] = ~*optr;
+               s[1] = ~0;
                s[2] = *nptr;
+               s[3] = 0;
        }
 
        *csum = csum_fold(csum_partial(s, 4, ~csum_unfold(*csum)));