From 77714f374ed746840e6e9ee6f8c89f9f27e65950 Mon Sep 17 00:00:00 2001
From: Thomas Schoebel-Theuer <tst@1und1.de>
Date: Fri, 20 Mar 2015 10:04:00 +0100
Subject: [PATCH] aio: safeguard ioctx

---
 kernel/mars_aio.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/mars_aio.c b/kernel/mars_aio.c
index 949c6a66..8e41161b 100644
--- a/kernel/mars_aio.c
+++ b/kernel/mars_aio.c
@@ -635,6 +635,11 @@ static int aio_event_thread(void *data)
 			.tv_sec = 1,
 		};
 
+		if (unlikely(!(void*)output->ctxp)) {
+			MARS_ERR("Oops, context vanished. queued_sum = %d\n", atomic_read(&tinfo->queued_sum));
+			break;
+		}
+
 		oldfs = get_fs();
 		set_fs(get_ds());
 		/* TODO: don't timeout upon termination.