https://www.openwall.com/lists/musl/2018/06/02/4
https://gitlab.com/qemu-project/qemu/-/issues/2485
https://bugs.gentoo.org/914256
--- a/src/network/netlink.h
+++ b/src/network/netlink.h
@@ -80,13 +80,17 @@ struct ifaddrmsg {
 #define NLMSG_DATALEN(nlh)	((nlh)->nlmsg_len-sizeof(struct nlmsghdr))
 #define NLMSG_DATAEND(nlh)	((char*)(nlh)+(nlh)->nlmsg_len)
 #define NLMSG_NEXT(nlh)		(struct nlmsghdr*)((char*)(nlh)+NETLINK_ALIGN((nlh)->nlmsg_len))
-#define NLMSG_OK(nlh,end)	((char*)(end)-(char*)(nlh) >= sizeof(struct nlmsghdr))
+#define NLMSG_OK(nlh,len)	((len) >= (int)sizeof(struct nlmsghdr) && \
+				 (nlh)->nlmsg_len >= sizeof(struct nlmsghdr) && \
+				 (nlh)->nlmsg_len <= (len))
 
 #define RTA_DATA(rta)		((void*)((char*)(rta)+sizeof(struct rtattr)))
 #define RTA_DATALEN(rta)	((rta)->rta_len-sizeof(struct rtattr))
 #define RTA_DATAEND(rta)	((char*)(rta)+(rta)->rta_len)
 #define RTA_NEXT(rta)		(struct rtattr*)((char*)(rta)+NETLINK_ALIGN((rta)->rta_len))
-#define RTA_OK(rta,end)		((char*)(end)-(char*)(rta) >= sizeof(struct rtattr))
+#define RTA_OK(rta,len)		((len) >= (int)sizeof(struct rtattr) && \
+				 (rta)->rta_len >= sizeof(struct rtattr) && \
+				 (rta)->rta_len <= (len))
 
 #define NLMSG_RTA(nlh,len)	((void*)((char*)(nlh)+sizeof(struct nlmsghdr)+NETLINK_ALIGN(len)))
 #define NLMSG_RTAOK(rta,nlh)	RTA_OK(rta,NLMSG_DATAEND(nlh))