[PATCH] net/memif: unregister callback on error in listener handler

[Dmitriy Matveichev <matveichev.dmitriy@gmail.com>]

Fix the crash if a memif client disconnects before a server says hello

Signed-off-by: Dmitriy Matveichev <matveichev.dmitriy@gmail.com>
---

If a memif client disconnects before a server says hello in memif_listener_handler we get errors 
"MEMIF: memif_msg_send_from_queue(): sendmsg fail: Broken pipe.
EAL: PANIC in eal_intr_thread_main():
Error adding fd 59 epoll_ctl, Bad file descriptor".
During the error handling in this func a socket is freed but the eal_intr_thread_main knows nothing about it. The descriptor becomes invalid after close. 
We should unregister callback from the eal_intr_thread_main loop and only after that we can safely free the socket. 

 .mailmap                         |  1 +
 drivers/net/memif/memif_socket.c | 10 ++++++----
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/.mailmap b/.mailmap
index fcb3d1bb3f..d0148b0d9c 100644
--- a/.mailmap
+++ b/.mailmap
@@ -409,6 +409,7 @@ Ding Zhi <zhi.ding@6wind.com>
 Diogo Behrens <diogo.behrens@huawei.com>
 Dirk-Holger Lenz <dirk.lenz@ng4t.com>
 Dmitri Epshtein <dima@marvell.com>
+Dmitriy Matveichev <matveichev.dmitriy@gmail.com>
 Dmitriy Yakovlev <bombermag@gmail.com>
 Dmitry Eremin-Solenikov <dmitry.ereminsolenikov@linaro.org>
 Dmitry Kozlyuk <dmitry.kozliuk@gmail.com> <dkozlyuk@nvidia.com>
diff --git a/drivers/net/memif/memif_socket.c b/drivers/net/memif/memif_socket.c
index 649f8d0e61..898ad75fa6 100644
--- a/drivers/net/memif/memif_socket.c
+++ b/drivers/net/memif/memif_socket.c
@@ -878,14 +878,16 @@ memif_listener_handler(void *arg)
 	return;
 
  error:
-	if (sockfd >= 0) {
-		close(sockfd);
-		sockfd = -1;
-	}
 	if (cc != NULL) {
+		rte_intr_callback_unregister(cc->intr_handle, memif_intr_handler,
+					 cc);
 		rte_intr_instance_free(cc->intr_handle);
 		rte_free(cc);
 	}
+	if (sockfd >= 0) {
+		close(sockfd);
+		sockfd = -1;
+	}
 }
 
 static struct memif_socket *
-- 
2.53.0