From 5ba048a475cfd728906875327ddceed4614a1c9d Mon Sep 17 00:00:00 2001 From: David Kalnischkies Date: Sun, 24 Dec 2017 10:31:29 +0100 Subject: do not remap current files if nullptrs in cache generation If the cache needs to grow to make room to insert volatile files like deb files into the cache we were remapping null-pointers making them non-null-pointers in the process causing trouble later on. Only the current Releasefile pointer can currently legally be a nullpointer as volatile files have no release file they belong to, but for safety the pointer to the current Packages file is equally guarded. The option APT::Cache-Start can be used to workaround this problem. Reported-By: Mattia Rizzolo on IRC --- apt-pkg/pkgcachegen.cc | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) (limited to 'apt-pkg') diff --git a/apt-pkg/pkgcachegen.cc b/apt-pkg/pkgcachegen.cc index 1748e8bc1..8fa231862 100644 --- a/apt-pkg/pkgcachegen.cc +++ b/apt-pkg/pkgcachegen.cc @@ -55,7 +55,7 @@ using APT::StringView; /* We set the dirty flag and make sure that is written to the disk */ pkgCacheGenerator::pkgCacheGenerator(DynamicMMap *pMap,OpProgress *Prog) : Map(*pMap), Cache(pMap,false), Progress(Prog), - CurrentRlsFile(NULL), CurrentFile(NULL), d(NULL) + CurrentRlsFile(nullptr), CurrentFile(nullptr), d(nullptr) { } bool pkgCacheGenerator::Start() @@ -159,8 +159,10 @@ void pkgCacheGenerator::ReMap(void const * const oldMap, void const * const newM Cache.ReMap(false); - CurrentFile += static_cast(newMap) - static_cast(oldMap); - CurrentRlsFile += static_cast(newMap) - static_cast(oldMap); + if (CurrentFile != nullptr) + CurrentFile += static_cast(newMap) - static_cast(oldMap); + if (CurrentRlsFile != nullptr) + CurrentRlsFile += static_cast(newMap) - static_cast(oldMap); for (std::vector::const_iterator i = Dynamic::toReMap.begin(); i != Dynamic::toReMap.end(); ++i) @@ -396,7 +398,7 @@ bool pkgCacheGenerator::MergeListVersion(ListParser &List, pkgCache::PkgIterator if (List.SameVersion(Hash, Ver) == true) break; // sort (volatile) sources above not-sources like the status file - if ((CurrentFile->Flags & pkgCache::Flag::NotSource) == 0) + if (CurrentFile == nullptr || (CurrentFile->Flags & pkgCache::Flag::NotSource) == 0) { auto VF = Ver.FileList(); for (; VF.end() == false; ++VF) @@ -818,7 +820,7 @@ bool pkgCacheGenerator::AddImplicitDepends(pkgCache::VerIterator &V, bool pkgCacheGenerator::NewFileVer(pkgCache::VerIterator &Ver, ListParser &List) { - if (CurrentFile == 0) + if (CurrentFile == nullptr) return true; // Get a structure @@ -903,7 +905,7 @@ map_pointer_t pkgCacheGenerator::NewVersion(pkgCache::VerIterator &Ver, bool pkgCacheGenerator::NewFileDesc(pkgCache::DescIterator &Desc, ListParser &List) { - if (CurrentFile == 0) + if (CurrentFile == nullptr) return true; // Get a structure @@ -1246,11 +1248,9 @@ bool pkgCacheListParser::SameVersion(unsigned short const Hash, /*{{{*/ bool pkgCacheGenerator::SelectReleaseFile(const string &File,const string &Site, unsigned long Flags) { + CurrentRlsFile = nullptr; if (File.empty() && Site.empty()) - { - CurrentRlsFile = NULL; return true; - } // Get some space for the structure map_pointer_t const idxFile = AllocateInMap(sizeof(*CurrentRlsFile)); @@ -1285,6 +1285,7 @@ bool pkgCacheGenerator::SelectFile(std::string const &File, std::string const &Component, unsigned long const Flags) { + CurrentFile = nullptr; // Get some space for the structure map_pointer_t const idxFile = AllocateInMap(sizeof(*CurrentFile)); if (unlikely(idxFile == 0)) @@ -1316,7 +1317,7 @@ bool pkgCacheGenerator::SelectFile(std::string const &File, return false; CurrentFile->Component = component; CurrentFile->Flags = Flags; - if (CurrentRlsFile != NULL) + if (CurrentRlsFile != nullptr) CurrentFile->Release = CurrentRlsFile - Cache.RlsFileP; else CurrentFile->Release = 0; -- cgit v1.2.3