shithub: riscv

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ref: 17a92f3995976b5d7618d1a2442e0028c1b192de
parent: adb36de077c9bcd99072e86c7f84bac46a58e326
author: cinap_lenrek <[email protected]>
date: Fri Feb 28 11:48:42 EST 2020

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.

--- a/sys/src/9/port/devproc.c

+++ b/sys/src/9/port/devproc.c

@@ -812,7 +812,7 @@

 	}

 	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;