From: Ian Lynagh <igloo@earth.li>
Date: Wed, 4 Aug 2010 17:36:36 +0000 (+0000)
Subject: Test for (fd < 0) before trying to FD_SET it
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=d0fb9a95f40453321b82e23d9b322e79340b48c9

Test for (fd < 0) before trying to FD_SET it
---

diff --git a/rts/posix/Select.c b/rts/posix/Select.c
index d36e122..932fc79 100644
--- a/rts/posix/Select.c
+++ b/rts/posix/Select.c
@@ -156,7 +156,7 @@ awaitEvent(rtsBool wait)
 	case BlockedOnRead:
 	  { 
 	    int fd = tso->block_info.fd;
-	    if (fd >= (int)FD_SETSIZE) {
+	    if ((fd >= (int)FD_SETSIZE) || (fd < 0)) {
 		barf("awaitEvent: descriptor out of range");
 	    }
 	    maxfd = (fd > maxfd) ? fd : maxfd;
@@ -167,7 +167,7 @@ awaitEvent(rtsBool wait)
 	case BlockedOnWrite:
 	  { 
 	    int fd = tso->block_info.fd;
-	    if (fd >= (int)FD_SETSIZE) {
+	    if ((fd >= (int)FD_SETSIZE) || (fd < 0)) {
 		barf("awaitEvent: descriptor out of range");
 	    }
 	    maxfd = (fd > maxfd) ? fd : maxfd;