Fix stack-based buffer overflow (CVE-2009-1759).

PR:		ports/139635
Submitted by:	Eygene Ryabinkin
Security:	http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1759

2 files changed, 87 insertions, 1 deletions

diff --git a/net-p2p/ctorrent/Makefile b/net-p2p/ctorrent/Makefile
index 57b8d84aa404..fc36f106a4fc 100644
--- a/net-p2p/ctorrent/Makefile
+++ b/net-p2p/ctorrent/Makefile
@@ -7,7 +7,7 @@
 
 PORTNAME=	ctorrent
 PORTVERSION=	3.3.2
-PORTREVISION=	1
+PORTREVISION=	2
 CATEGORIES=	net-p2p
 MASTER_SITES=	http://www.rahul.net/dholmes/ctorrent/
 DISTNAME=	${PORTNAME}-dnh${PORTVERSION}
diff --git a/net-p2p/ctorrent/files/patch-cve-2009-1759 b/net-p2p/ctorrent/files/patch-cve-2009-1759
new file mode 100644
index 000000000000..155fe9d6eb99
--- /dev/null
+++ b/net-p2p/ctorrent/files/patch-cve-2009-1759
@@ -0,0 +1,86 @@
+Obtained-From: http://sourceforge.net/tracker/download.php?group_id=202532&atid=981959&file_id=325065&aid=2782875
+
+Index: bencode.h
+===================================================================
+--- bencode.h	(revision 301)
++++ bencode.h	(revision 302)
+@@ -25,7 +25,7 @@
+ size_t decode_list(const char *b,size_t len,const char *keylist);
+ size_t decode_rev(const char *b,size_t len,const char *keylist);
+ size_t decode_query(const char *b,size_t len,const char *keylist,const char **ps,size_t *pi,int64_t *pl,int method);
+-size_t decode_list2path(const char *b, size_t n, char *pathname);
++size_t decode_list2path(const char *b, size_t n, char *pathname, size_t maxlen);
+ size_t bencode_buf(const char *str,size_t len,FILE *fp);
+ size_t bencode_str(const char *str, FILE *fp);
+ size_t bencode_int(const uint64_t integer, FILE *fp);
+Index: bencode.cpp
+===================================================================
+--- bencode.cpp	(revision 301)
++++ bencode.cpp	(revision 302)
+@@ -233,22 +233,28 @@
+   return bencode_end_dict_list(fp);
+ }
+ 
+-size_t decode_list2path(const char *b, size_t n, char *pathname)
++size_t decode_list2path(const char *b, size_t n, char *pathname, size_t maxlen)
+ {
+   const char *pb = b;
+   const char *s = (char *) 0;
++  const char *endmax = pathname + maxlen - 1;
+   size_t r,q;
+ 
+   if( 'l' != *pb ) return 0;
+   pb++;
+   n--;
+   if( !n ) return 0;
+-  for(; n;){
++  while( n && pathname < endmax ){
+     if(!(r = buf_str(pb, n, &s, &q)) ) return 0;
++    if( q >= maxlen ) return 0;
+     memcpy(pathname, s, q);
+     pathname += q;
+-    pb += r; n -= r; 
+-    if( 'e' != *pb ){*pathname = PATH_SP, pathname++;} else break;
++    maxlen -= q;
++    pb += r;
++    n -= r; 
++    if( 'e' == *pb ) break;
++    if( pathname >= endmax ) return 0;
++    *pathname++ = PATH_SP;
+   }
+   *pathname = '\0';
+   return (pb - b + 1);
+Index: btfiles.cpp
+===================================================================
+--- btfiles.cpp	(revision 301)
++++ btfiles.cpp	(revision 302)
+@@ -471,6 +471,8 @@
+     BTFILE *pbf_last = (BTFILE*) 0; 
+     BTFILE *pbf = (BTFILE*) 0;
+     size_t dl;
++    unsigned long nfiles = 0;
++
+     if( decode_query(metabuf,metabuf_len,"info|length",
+                     (const char**) 0,(size_t*) 0,(int64_t*) 0,QUERY_LONG) )
+       return -1;
+@@ -524,12 +526,18 @@
+ #ifndef WINDOWS
+       if( !pbf ) return -1;
+ #endif
++      nfiles++;
+       pbf->bf_length = t;
+       m_total_files_length += t;
+       r = decode_query(p, dl, "path", (const char **)0, &n, (int64_t*)0,
+                        QUERY_POS);
+-      if( !r ) return -1;
+-      if(!decode_list2path(p + r, n, path)) return -1;
++      if( !r || !decode_list2path(p + r, n, path, sizeof(path)) ){
++        CONSOLE.Warning(1,
++          "error, invalid path in torrent data for file %lu at offset %llu",
++          nfiles, m_total_files_length - t);
++        delete pbf;
++        return -1;
++      }
+ 
+       int f_conv;
+       char *tmpfn = new char[strlen(path)*2+5];