From 526680e977a5cba18bed63be0564c5505a1b0b64 Mon Sep 17 00:00:00 2001
From: Christian Prochaska <christian.prochaska@genode-labs.com>
Date: Tue, 10 Jul 2018 14:58:17 +0200
Subject: [PATCH] libc: initialize fd sets before use in 'poll()'

Fixes #2914
---
 repos/libports/src/lib/libc/poll.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/repos/libports/src/lib/libc/poll.cc b/repos/libports/src/lib/libc/poll.cc
index e5cf9a4824..b23249d4b2 100644
--- a/repos/libports/src/lib/libc/poll.cc
+++ b/repos/libports/src/lib/libc/poll.cc
@@ -61,6 +61,11 @@ poll(struct pollfd fds[], nfds_t nfds, int timeout)
 	}
 
 	/* populate event bit vectors for the events we're interested in */
+
+	FD_ZERO(&readfds);
+	FD_ZERO(&writefds);
+	FD_ZERO(&exceptfds);
+
 	for (i = 0; i < nfds; i++) {
 		fd = fds[i].fd;
 		if (fd == -1)