From 0cc1faf015a253ef64b97a8453b6fc959c0ee512 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Thu, 14 Jan 2021 09:59:03 -0500
Subject: lib9: reject postnote with special pids

---
 src/lib9/postnote.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/lib9/postnote.c')

diff --git a/src/lib9/postnote.c b/src/lib9/postnote.c
index 68e6d2f6..d750c69d 100644
--- a/src/lib9/postnote.c
+++ b/src/lib9/postnote.c
@@ -18,6 +18,11 @@ postnote(int who, int pid, char *msg)
 		return -1;
 	}
 
+	if(pid <= 0){
+		werrstr("bad pid in postnote");
+		return -1;
+	}
+
 	switch(who){
 	default:
 		werrstr("bad who in postnote");
-- 
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