diff options
| -rw-r--r-- | src/libsystemd-dhcp/dhcp-client.c | 7 | ||||
| -rw-r--r-- | src/libsystemd-dhcp/test-dhcp-client.c | 7 |
2 files changed, 10 insertions, 4 deletions
diff --git a/src/libsystemd-dhcp/dhcp-client.c b/src/libsystemd-dhcp/dhcp-client.c index 7dc1546128..68a3b1a1b6 100644 --- a/src/libsystemd-dhcp/dhcp-client.c +++ b/src/libsystemd-dhcp/dhcp-client.c @@ -382,10 +382,13 @@ 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 client_append_ip_headers(DHCPPacket *packet, uint16_t len) diff --git a/src/libsystemd-dhcp/test-dhcp-client.c b/src/libsystemd-dhcp/test-dhcp-client.c index d398510745..7400cc6837 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) |