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From a585382b972c25ee8489147d94918d001ef439a7 Mon Sep 17 00:00:00 2001
From: Christian Brauner <christian.brauner@ubuntu.com>
Date: Thu, 28 Oct 2021 17:39:42 +0200
Subject: [PATCH] start: check event loop type before closing fd
Since this is a union we might otherwise stomp on io_uring mmap()ed
memory.
Fixes: #4016
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
---
src/lxc/start.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/lxc/start.c b/src/lxc/start.c
index 8f7173ec8c..1a6046c7a4 100644
--- a/src/lxc/start.c
+++ b/src/lxc/start.c
@@ -629,7 +629,8 @@ int lxc_poll(const char *name, struct lxc_handler *handler)
TRACE("Mainloop is ready");
ret = lxc_mainloop(&descr, -1);
- close_prot_errno_disarm(descr.epfd);
+ if (descr.type == LXC_MAINLOOP_EPOLL)
+ close_prot_errno_disarm(descr.epfd);
if (ret < 0 || !handler->init_died)
goto out_mainloop_console;
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