X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flibsystemd-network%2Fsd-dhcp-client.c;h=392e294ae43e27fe404c30c03542347e201eb99b;hp=da41c478eaeb477ba286001e5517abc6014ccca9;hb=48a4612e6b67ae81b93ee8e8a4b3f8efa5324270;hpb=7429b07f822348dc5a87208ce107f5f6bf02656d

diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c
index da41c478e..392e294ae 100644
--- a/src/libsystemd-network/sd-dhcp-client.c
+++ b/src/libsystemd-network/sd-dhcp-client.c
@@ -1124,8 +1124,10 @@ static int client_receive_message_raw(sd_event_source *s, int fd,
                 return 0;
 
         for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
-                if (cmsg->cmsg_level == SOL_PACKET && cmsg->cmsg_type == PACKET_AUXDATA) {
-                        struct tpacket_auxdata *aux = (void *)CMSG_DATA(cmsg);
+                if (cmsg->cmsg_level == SOL_PACKET &&
+                    cmsg->cmsg_type == PACKET_AUXDATA &&
+                    cmsg->cmsg_len == CMSG_LEN(sizeof(struct tpacket_auxdata))) {
+                        struct tpacket_auxdata *aux = (struct tpacket_auxdata*)CMSG_DATA(cmsg);
 
                         checksum = !(aux->tp_status & TP_STATUS_CSUMNOTREADY);
                         break;