--- http.c.ori	2009-08-11 21:02:20.000000000 -0300
+++ http.c	2009-08-11 21:01:59.000000000 -0300
@@ -278,6 +278,8 @@
 		if (!io->buf || io->bufpos == io->buflen)
 			if (http_fillbuf(io, len) < 1)
 				break;
+		if (io->buflen < io->bufpos)
+			return(-1);
 		l = io->buflen - io->bufpos;
 		if (len < l)
 			l = len;