* apt-pkg/pkgcachegen.{cc,h}:

  - use ref-to-ptr semantic in NewDepends() to ensure that the   
    libapt does not segfault if the cache is remapped in between
    (LP: #812862)

apt-pkg/pkgcachegen.cc

@@ -105,6 +105,9 @@ void pkgCacheGenerator::ReMap(void const * const oldMap, void const * const newM
    if (oldMap == newMap)
       return;
 
+   if (_config->FindB("Debug::pkgCacheGen", false))
+      std::clog << "Remaping from " << oldMap << " to " << newMap << std::endl;
+
    Cache.ReMap(false);
 
    CurrentFile += (pkgCache::PackageFile*) newMap - (pkgCache::PackageFile*) oldMap;
@@ -684,7 +687,7 @@ bool pkgCacheGenerator::NewDepends(pkgCache::PkgIterator &Pkg,
 				   string const &Version,
 				   unsigned int const &Op,
 				   unsigned int const &Type,
-				   map_ptrloc *OldDepLast)
+				   map_ptrloc* &OldDepLast)
 {
    void const * const oldMap = Map.Data();
    // Get a structure

apt-pkg/pkgcachegen.h

@@ -75,7 +75,7 @@ class pkgCacheGenerator							/*{{{*/
    bool NewFileDesc(pkgCache::DescIterator &Desc,ListParser &List);
    bool NewDepends(pkgCache::PkgIterator &Pkg, pkgCache::VerIterator &Ver,
 		   string const &Version, unsigned int const &Op,
-		   unsigned int const &Type, map_ptrloc *OldDepLast);
+		   unsigned int const &Type, map_ptrloc* &OldDepLast);
    unsigned long NewVersion(pkgCache::VerIterator &Ver,const string &VerStr,unsigned long Next);
    map_ptrloc NewDescription(pkgCache::DescIterator &Desc,const string &Lang,const MD5SumValue &md5sum,map_ptrloc Next);
 

debian/changelog

@@ -17,6 +17,10 @@ apt (0.8.15.2) unstable; urgency=high
       that changes in the ordering there will be honored by apt
   * apt-pkg/sourcelist.{cc,h}:
     - add pkgSourceList::GetLastModifiedTime() helper
+  * apt-pkg/pkgcachegen.{cc,h}:
+    - use ref-to-ptr semantic in NewDepends() to ensure that the   
+      libapt does not segfault if the cache is remapped in between
+      (LP: #812862)
 
  -- Michael Vogt <mvo@debian.org>  Tue, 12 Jul 2011 11:54:47 +0200