X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flibsystemd-dhcp%2Ftest-dhcp-client.c;fp=src%2Flibsystemd-dhcp%2Ftest-dhcp-client.c;h=7400cc6837e72b48fd22692d031f7beab871cab9;hp=d398510745f373049c4e122da48a882b04a377b1;hb=0c6a3c888abd720b5ab28162d1ba4eadffde5272;hpb=77e8d29dd2ecfa7f11c31c8d96021d323ab3fe3a

diff --git a/src/libsystemd-dhcp/test-dhcp-client.c b/src/libsystemd-dhcp/test-dhcp-client.c
index d39851074..7400cc683 100644
--- a/src/libsystemd-dhcp/test-dhcp-client.c
+++ b/src/libsystemd-dhcp/test-dhcp-client.c
@@ -102,10 +102,13 @@ static uint16_t client_checksum(void *buf, int len)
 
         if (len & 0x01) {
                 odd = buf;
-                sum += odd[len];
+                sum += odd[len - 1];
         }
 
-        return ~((sum & 0xffff) + (sum >> 16));
+        while (sum >> 16)
+                sum = (sum & 0xffff) + (sum >> 16);
+
+        return ~sum;
 }
 
 static void test_checksum(void)