From 80f2165d274da5185a09ebda340505b067b08eb4 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Mon, 5 May 2008 23:08:35 -0400
Subject: libthread: input sanity checks

---
 src/libthread/channel.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'src/libthread')

diff --git a/src/libthread/channel.c b/src/libthread/channel.c
index 080f84de..4fdf5e50 100644
--- a/src/libthread/channel.c
+++ b/src/libthread/channel.c
@@ -96,9 +96,8 @@ altcanexec(Alt *a)
 	_Altarray *ar;
 	Channel *c;
 
-	if(a->op == CHANNOP)
+	if(a->op == CHANNOP || (c=a->c) == nil)
 		return 0;
-	c = a->c;
 	if(c->bufsize == 0){
 		ar = chanarray(c, otherop(a->op));
 		return ar && ar->n;
@@ -119,6 +118,8 @@ altqueue(Alt *a)
 {
 	_Altarray *ar;
 
+	if(a->c == nil)
+		return;
 	ar = chanarray(a->c, a->op);
 	addarray(ar, a);
 }
-- 
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