From 17a92f3995976b5d7618d1a2442e0028c1b192de Mon Sep 17 00:00:00 2001
From: cinap_lenrek <cinap_lenrek@felloff.net>
Date: Fri, 28 Feb 2020 16:48:42 +0100
Subject: [PATCH] devproc: make sure writewatchpt() doesnt overflow the
 watchpoint array

the user buffer could be changed while we parse it resulting
in a different number of watchpoints than initially calculated.
so add a check to the parse loop so we wont overflow the
watchpoint array.
---
 sys/src/9/port/devproc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sys/src/9/port/devproc.c b/sys/src/9/port/devproc.c
index b2509ddcb..4692eafda 100644
--- a/sys/src/9/port/devproc.c
+++ b/sys/src/9/port/devproc.c
@@ -812,7 +812,7 @@ writewatchpt(Proc *pr, char *buf, int nbuf, uvlong offset)
 	}
 	if(nwp0 > 0)
 		memmove(wp, pr->watchpt, sizeof(Watchpt) * nwp0);
-	for(wq = wp + nwp0;;){
+	for(wq = wp + nwp0; wq < wp + nwp0+nwp;){
 		q = memchr(p, '\n', e - p);
 		if(q == nil)
 			break;