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ip/chandial: fail with Ebadarg instead of printing memory contents

--- a/sys/src/9/ip/chandial.c

+++ b/sys/src/9/ip/chandial.c

@@ -40,7 +40,7 @@

 	ds.ctlp = ctlp;

 	_dial_string_parse(dest, &ds);

-	if(ds.netdir == 0)

+	if(ds.netdir == nil)

 		ds.netdir = "/net";

 	/* no connection server, don't translate */

@@ -109,11 +109,13 @@

 		ds->rem = ds->buf;

 	} else {

 		if(*ds->buf != '/' && *ds->buf != '#'){

-			ds->netdir = 0;

+			ds->netdir = nil;

 			ds->proto = ds->buf;

 		} else {

-			for(p2 = p; *p2 != '/'; p2--)

+			for(p2 = p; *p2 != '/' && p2 != ds->buf; p2--)

 				;

+			if(p2 == ds->buf)

+				error(Ebadarg);

 			*p2++ = 0;

 			ds->netdir = ds->buf;

 			ds->proto = p2;