Check args.

Author: jfb8856606

lib/ff_dpdk_if.c

@@ -2134,6 +2134,17 @@ int
 ff_dpdk_if_send(struct ff_dpdk_if_context *ctx, void *m,
     int total)
 {
+    /* FU-CB-DPDKIF-NULLGUARD: defend against NULL ctx callers. The
+     * function dereferences ctx->port_id / ctx->hw_features in both the
+     * FF_USE_PAGE_ARRAY and the default mempool paths; a NULL ctx would
+     * SIGSEGV. Treat it as a tx-drop and free any caller-supplied mbuf. */
+    if (unlikely(ctx == NULL)) {
+        ff_traffic.tx_dropped++;
+        if (m != NULL) {
+            ff_mbuf_free(m);
+        }
+        return -1;
+    }
 #ifdef FF_USE_PAGE_ARRAY
     struct lcore_conf *qconf = &lcore_conf;
     int    len = 0;