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=== Description (from pull-request) ===
Signed-off-by: dongxinhua <dongxin...@huawei.com>
From c62e88dd54bdb4e9f74642c716ca720313adda41 Mon Sep 17 00:00:00 2001
From: dongxinhua <dongxin...@huawei.com>
Date: Sat, 21 Dec 2019 17:44:40 +0800
Subject: [PATCH] fd: only add valid fd to mainloop

Signed-off-by: dongxinhua <dongxin...@huawei.com>
---
 src/lxc/mainloop.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/lxc/mainloop.c b/src/lxc/mainloop.c
index b169aa6fe2..30ce624045 100644
--- a/src/lxc/mainloop.c
+++ b/src/lxc/mainloop.c
@@ -84,6 +84,8 @@ int lxc_mainloop_add_handler(struct lxc_epoll_descr *descr, 
int fd,
        struct epoll_event ev;
        struct mainloop_handler *handler;
        struct lxc_list *item;
+       if (fd < 0)
+               return 0;
 
        handler = malloc(sizeof(*handler));
        if (!handler)
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