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kernel: dont rely on atoi() parsing hex for netif/devbridge

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

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

@@ -537,7 +537,7 @@

 		dev2 = argv[4];

 	} else

 		error(usage);

-	ownhash = atoi(argv[2]);

+	ownhash = strtoul(argv[2], 0, 0);

 	dev = argv[3];

 	for(i=0; i<b->nport; i++) {

 		port = b->port[i];

@@ -643,7 +643,7 @@

 	} else

 		error(usage);

 	if(argc == 3)

-		ownhash = atoi(argv[2]);

+		ownhash = strtoul(argv[2], 0, 0);

 	else

 		ownhash = 0;

 	for(i=0; i<b->nport; i++) {

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

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

@@ -308,7 +308,7 @@

 	qlock(nif);

 	f = nif->f[NETID(c->qid.path)];

 	if((p = matchtoken(buf, "connect")) != 0){

-		type = atoi(p);

+		type = strtoul(p, 0, 0);

 		if(typeinuse(nif, type))

 			error(Einuse);

 		f->type = type;

-- 

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