--- acpi_ids.c.old	2009-04-29 16:37:13.000000000 +0200
+++ acpi_ids.c	2009-05-03 16:13:19.000000000 +0200
@@ -92,12 +92,13 @@
 	 */
 	struct rtattr *tb[CTRL_ATTR_MAX + 1];
 	/* pointer to the generic netlink header in the incoming message */
-	struct genlmsghdr *ghdr = NLMSG_DATA(n);
+	struct genlmsghdr ghdr;
 	/* length of the attribute and payload */
 	int len = n->nlmsg_len - NLMSG_LENGTH(GENL_HDRLEN);
 	/* Pointer to the attribute portion of the message */
 	struct rtattr *attrs;
 
+	memcpy(&ghdr, NLMSG_DATA(n), sizeof(ghdr));
 	if (len < 0) {
 		fprintf(stderr, "%s: netlink CTRL_CMD_GETFAMILY response, "
 			"wrong controller message len: %d\n", progname, len);
@@ -111,18 +112,18 @@
 		return 0;
 	}
 
-	if (ghdr->cmd != CTRL_CMD_GETFAMILY &&
-	    ghdr->cmd != CTRL_CMD_DELFAMILY &&
-	    ghdr->cmd != CTRL_CMD_NEWFAMILY &&
-	    ghdr->cmd != CTRL_CMD_NEWMCAST_GRP &&
-	    ghdr->cmd != CTRL_CMD_DELMCAST_GRP) {
+	if (ghdr.cmd != CTRL_CMD_GETFAMILY &&
+	    ghdr.cmd != CTRL_CMD_DELFAMILY &&
+	    ghdr.cmd != CTRL_CMD_NEWFAMILY &&
+	    ghdr.cmd != CTRL_CMD_NEWMCAST_GRP &&
+	    ghdr.cmd != CTRL_CMD_DELMCAST_GRP) {
 		fprintf(stderr, "%s: unknown netlink controller command %d\n",
-			progname, ghdr->cmd);
+			progname, ghdr.cmd);
 		return 0;
 	}
 
 	/* set attrs to point to the attribute */
-	attrs = (struct rtattr *)((char *)ghdr + GENL_HDRLEN);
+	attrs = (struct rtattr *)((char *)NLMSG_DATA(n) + GENL_HDRLEN);
 	/* Read the table from the message into "tb".  This actually just  */
 	/* places pointers into the message into tb[].  */
 	parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len);
@@ -168,7 +169,7 @@
 	/* pointer to the nlmsghdr in req */
 	struct nlmsghdr *nlh;
 	/* pointer to the generic netlink header in req */
-	struct genlmsghdr *ghdr;
+	struct genlmsghdr ghdr;
 	/* return value */
 	int ret = -1;
 
@@ -183,9 +184,9 @@
 	nlh->nlmsg_type = GENL_ID_CTRL;
 
 	/* set up ghdr to point to the generic netlink header */
-	ghdr = NLMSG_DATA(&req.n);
 	/* set the command we want to run: "GETFAMILY" */
-	ghdr->cmd = CTRL_CMD_GETFAMILY;
+	ghdr.cmd = CTRL_CMD_GETFAMILY;
+	memcpy(NLMSG_DATA(&req.n), &ghdr, sizeof(ghdr));
 
 	/* the message payload is the family name */
 	addattr_l(nlh, 128, CTRL_ATTR_FAMILY_NAME,