[PATCH bpf-next v7 04/15] selftests/bpf: test_xsk: fix memory leak in testapp_stats_rx_dropped()

["Bastien Curutchet (eBPF Foundation)" <bastien.curutchet@bootlin.com>]

testapp_stats_rx_dropped() generates pkt_stream twice. The last
generated is released by pkt_stream_restore_default() at the end of the
test but we lose the pointer of the first pkt_stream.

Release the 'middle' pkt_stream when it's getting replaced to prevent
memory leaks.

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Bastien Curutchet (eBPF Foundation) <bastien.curutchet@bootlin.com>
---
 tools/testing/selftests/bpf/test_xsk.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/testing/selftests/bpf/test_xsk.c b/tools/testing/selftests/bpf/test_xsk.c
index 8d7c38eb32ca3537cb019f120c3350ebd9f8c6bc..eb18288ea1e4aa1c9337d16333b7174ecaed0999 100644
--- a/tools/testing/selftests/bpf/test_xsk.c
+++ b/tools/testing/selftests/bpf/test_xsk.c
@@ -536,6 +536,13 @@ static void pkt_stream_receive_half(struct test_spec *test)
 	struct pkt_stream *pkt_stream = test->ifobj_tx->xsk->pkt_stream;
 	u32 i;
 
+	if (test->ifobj_rx->xsk->pkt_stream != test->rx_pkt_stream_default)
+		/* Packet stream has already been replaced so we have to release this one.
+		 * The newly created one will be freed by the restore_default() at the
+		 * end of the test
+		 */
+		pkt_stream_delete(test->ifobj_rx->xsk->pkt_stream);
+
 	test->ifobj_rx->xsk->pkt_stream = pkt_stream_generate(pkt_stream->nb_pkts,
 							      pkt_stream->pkts[0].len);
 	pkt_stream = test->ifobj_rx->xsk->pkt_stream;

-- 
2.51.0