plan9port

commit 0cc1faf015a253ef64b97a8453b6fc959c0ee512
parent fdcf3d70c24886dddb5fd7052dfada67d33d5c75
Author: Russ Cox <rsc@swtch.com>
Date:   Thu, 14 Jan 2021 09:59:03 -0500

lib9: reject postnote with special pids

Diffstat:
M
src/lib9/postnote.c
 | 
5
+++++

1 file changed, 5 insertions(+), 0 deletions(-)
diff --git 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");