criu: fix two issue with possible out-of-bound access

Signed-off-by: Andrei Vagin <avagin@openvz.org>

criu/kerndat.c

@@ -197,7 +197,7 @@ int kerndat_files_stat(bool early)
 				buf[ret] = '\0';
 				max_files = atol(buf);
 			}
-			ret = read(fd2, buf, sizeof(buf));
+			ret = read(fd2, buf, sizeof(buf) - 1);
 			if (ret > 0) {
 				buf[ret] = '\0';
 				nr_open = atol(buf);

criu/pie/parasite.c

@@ -630,7 +630,7 @@ static int parasite_dump_cgroup(struct parasite_dump_cgroup_args *args)
 		return -1;
 	}
 
-	if (len == sizeof(*args)) {
+	if (len == sizeof(args->contents)) {
 		pr_warn("/proc/self/cgroup was bigger than the page size\n");
 		return -1;
 	}