selftests/bpf: test_xsk: fix memory leak in testapp_xdp_shared_umem()

testapp_xdp_shared_umem() generates pkt_stream on each xsk from xsk_arr,
where normally xsk_arr[0] gets pkt_streams and xsk_arr[1] have them NULLed.
At the end of the test pkt_stream_restore_default() only releases
xsk_arr[0] which leads to memory leaks.

Release the missing pkt_stream at the end of testapp_xdp_shared_umem()

Reviewed-by: Maciej Fijalkowski <[email protected]>
Signed-off-by: Bastien Curutchet (eBPF Foundation) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

Author: bastien-curutchet

tools/testing/selftests/bpf/test_xsk.c

@@ -570,6 +570,22 @@ static void pkt_stream_even_odd_sequence(struct test_spec *test)
 	}
 }
 
+static void release_even_odd_sequence(struct test_spec *test)
+{
+	struct pkt_stream *later_free_tx = test->ifobj_tx->xsk->pkt_stream;
+	struct pkt_stream *later_free_rx = test->ifobj_rx->xsk->pkt_stream;
+	int i;
+
+	for (i = 0; i < test->nb_sockets; i++) {
+		/* later_free_{rx/tx} will be freed by restore_default() */
+		if (test->ifobj_tx->xsk_arr[i].pkt_stream != later_free_tx)
+			pkt_stream_delete(test->ifobj_tx->xsk_arr[i].pkt_stream);
+		if (test->ifobj_rx->xsk_arr[i].pkt_stream != later_free_rx)
+			pkt_stream_delete(test->ifobj_rx->xsk_arr[i].pkt_stream);
+	}
+
+}
+
 static u64 pkt_get_addr(struct pkt *pkt, struct xsk_umem_info *umem)
 {
 	if (!pkt->valid)
@@ -2043,6 +2059,7 @@ int testapp_xdp_shared_umem(struct test_spec *test)
 {
 	struct xsk_xdp_progs *skel_rx = test->ifobj_rx->xdp_progs;
 	struct xsk_xdp_progs *skel_tx = test->ifobj_tx->xdp_progs;
+	int ret;
 
 	test->total_steps = 1;
 	test->nb_sockets = 2;
@@ -2053,7 +2070,11 @@ int testapp_xdp_shared_umem(struct test_spec *test)
 
 	pkt_stream_even_odd_sequence(test);
 
-	return testapp_validate_traffic(test);
+	ret = testapp_validate_traffic(test);
+
+	release_even_odd_sequence(test);
+
+	return ret;
 }
 
 int testapp_poll_txq_tmout(struct test_spec *test)