From 40f0f4a07f08b301d9ed90c6b99659dfc795e371 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sat, 12 Oct 2019 20:40:06 +0100
Subject: [PATCH] test: udp-preload: Cope with -ve fds

Eg, Tcl passes -1 to close (!)

 #0  0x00007f62949883ca in close (fd=-1) at udp-preload.c:207
 #1  0x00007f6294719362 in Tcl_FinalizeNotifier () from /usr/lib/x86_64-linux-gnu/libtcl8.6.so

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 test/udp-preload.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/test/udp-preload.c b/test/udp-preload.c
index 94b399a..b4c0879 100644
--- a/test/udp-preload.c
+++ b/test/udp-preload.c
@@ -96,7 +96,7 @@ static fdinfo **table;
 static int tablesz;
 
 static fdinfo *lookup(int fd) {
-    if (fd>=tablesz) return 0;
+    if (fd<0 || fd>=tablesz) return 0;
     return table[fd];
 }
 
@@ -203,7 +203,7 @@ WRAP(socket) {
 }
 
 WRAP(close) {
-    if (fd<tablesz) {
+    if (fd>=0 && fd<tablesz) {
 	free(table[fd]);
 	table[fd]=0;
     }
-- 
2.30.2