From aa15137c15d2fe6ca4d802c02c6f844072648936 Mon Sep 17 00:00:00 2001 From: Damien Miller Date: Wed, 26 Jun 2002 19:14:08 +1000 Subject: - (djm) OpenBSD CVS Sync - markus@cvs.openbsd.org 2002/06/26 08:53:12 [bufaux.c] limit size of BNs to 8KB; ok provos/deraadt --- bufaux.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) (limited to 'bufaux.c') diff --git a/bufaux.c b/bufaux.c index 80abe890b..d3dc674ce 100644 --- a/bufaux.c +++ b/bufaux.c @@ -37,7 +37,7 @@ */ #include "includes.h" -RCSID("$OpenBSD: bufaux.c,v 1.26 2002/06/23 09:46:51 deraadt Exp $"); +RCSID("$OpenBSD: bufaux.c,v 1.27 2002/06/26 08:53:12 markus Exp $"); #include #include "bufaux.h" @@ -88,6 +88,8 @@ buffer_get_bignum(Buffer *buffer, BIGNUM *value) bits = GET_16BIT(buf); /* Compute the number of binary bytes that follow. */ bytes = (bits + 7) / 8; + if (bytes > 8 * 1024) + fatal("buffer_get_bignum: cannot handle BN of size %d", bytes); if (buffer_len(buffer) < bytes) fatal("buffer_get_bignum: input buffer too small"); bin = buffer_ptr(buffer); @@ -129,13 +131,15 @@ buffer_put_bignum2(Buffer *buffer, BIGNUM *value) xfree(buf); } +/* XXX does not handle negative BNs */ void buffer_get_bignum2(Buffer *buffer, BIGNUM *value) { - /**XXX should be two's-complement */ - int len; - u_char *bin = buffer_get_string(buffer, (u_int *)&len); + u_int len; + u_char *bin = buffer_get_string(buffer, &len); + if (len > 8 * 1024) + fatal("buffer_get_bignum2: cannot handle BN of size %d", len); BN_bin2bn(bin, len, value); xfree(bin); } -- cgit v1.2.3