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mothra: fix libpanel entry buffer overflow when pasting text

--- a/sys/src/cmd/mothra/libpanel/entry.c

+++ b/sys/src/cmd/mothra/libpanel/entry.c

@@ -28,16 +28,17 @@

 			write(fd, ep->entry, n);

 		ep->entp=ep->entry;

 	}else{

-		if((s=malloc(1024+SLACK))==0){

+		n = 1024;

+		if((s=malloc(n+SLACK))==0){

 			close(fd);

 			return;

 		}

-		if((n=readn(fd, s, 1024))<0)

+		if((n=readn(fd, s, n))<0)

 			n=0;

 		free(ep->entry);

 		s=realloc(s, n+SLACK);

 		ep->entry=s;

-		ep->eent=s+n+SLACK;

+		ep->eent=s+n;

 		ep->entp=s+n;

 	}

 	close(fd);

@@ -129,9 +130,9 @@

 			ep->entp=ep->entry+n;

 			ep->eent=ep->entp+100;

 		}

+		*ep->entp='\0';

 		break;

 	}

-	memset(ep->entp, 0, SLACK);

 	pldraw(p, p->b);

 }

 Point pl_getsizeentry(Panel *p, Point children){

-- 

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