* apt-pkg/cacheiterator.h:

  - do not segfault if cache is not build (Closes: #254770)

apt-pkg/cacheiterators.h

@@ -96,7 +96,7 @@ class pkgCache::GrpIterator: public Iterator<Group, GrpIterator> {
 
 	protected:
 	inline Group* OwnerPointer() const {
-		return Owner->GrpP;
+		return (Owner != 0) ? Owner->GrpP : 0;
 	};
 
 	public:
@@ -137,7 +137,7 @@ class pkgCache::PkgIterator: public Iterator<Package, PkgIterator> {
 
 	protected:
 	inline Package* OwnerPointer() const {
-		return Owner->PkgP;
+		return (Owner != 0) ? Owner->PkgP : 0;
 	};
 
 	public:
@@ -184,7 +184,7 @@ class pkgCache::PkgIterator: public Iterator<Package, PkgIterator> {
 class pkgCache::VerIterator : public Iterator<Version, VerIterator> {
 	protected:
 	inline Version* OwnerPointer() const {
-		return Owner->VerP;
+		return (Owner != 0) ? Owner->VerP : 0;
 	};
 
 	public:
@@ -241,7 +241,7 @@ class pkgCache::VerIterator : public Iterator<Version, VerIterator> {
 class pkgCache::DescIterator : public Iterator<Description, DescIterator> {
 	protected:
 	inline Description* OwnerPointer() const {
-		return Owner->DescP;
+		return (Owner != 0) ? Owner->DescP : 0;
 	};
 
 	public:
@@ -270,7 +270,7 @@ class pkgCache::DepIterator : public Iterator<Dependency, DepIterator> {
 
 	protected:
 	inline Dependency* OwnerPointer() const {
-		return Owner->DepP;
+		return (Owner != 0) ? Owner->DepP : 0;
 	};
 
 	public:
@@ -315,7 +315,7 @@ class pkgCache::PrvIterator : public Iterator<Provides, PrvIterator> {
 
 	protected:
 	inline Provides* OwnerPointer() const {
-		return Owner->ProvideP;
+		return (Owner != 0) ? Owner->ProvideP : 0;
 	};
 
 	public:
@@ -349,7 +349,7 @@ class pkgCache::PrvIterator : public Iterator<Provides, PrvIterator> {
 class pkgCache::PkgFileIterator : public Iterator<PackageFile, PkgFileIterator> {
 	protected:
 	inline PackageFile* OwnerPointer() const {
-		return Owner->PkgFileP;
+		return (Owner != 0) ? Owner->PkgFileP : 0;
 	};
 
 	public:
@@ -382,7 +382,7 @@ class pkgCache::PkgFileIterator : public Iterator<PackageFile, PkgFileIterator>
 class pkgCache::VerFileIterator : public pkgCache::Iterator<VerFile, VerFileIterator> {
 	protected:
 	inline VerFile* OwnerPointer() const {
-		return Owner->VerFileP;
+		return (Owner != 0) ? Owner->VerFileP : 0;
 	};
 
 	public:
@@ -401,7 +401,7 @@ class pkgCache::VerFileIterator : public pkgCache::Iterator<VerFile, VerFileIter
 class pkgCache::DescFileIterator : public Iterator<DescFile, DescFileIterator> {
 	protected:
 	inline DescFile* OwnerPointer() const {
-		return Owner->DescFileP;
+		return (Owner != 0) ? Owner->DescFileP : 0;
 	};
 
 	public:

apt-pkg/policy.cc

@@ -45,6 +45,8 @@ using namespace std;
    file matches the V0 policy engine. */
 pkgPolicy::pkgPolicy(pkgCache *Owner) : Pins(0), PFPriority(0), Cache(Owner)
 {
+   if (Owner == 0 || &(Owner->Head()) == 0)
+      return;
    PFPriority = new signed short[Owner->Head().PackageFileCount];
    Pins = new Pin[Owner->Head().PackageCount];
 

debian/changelog

@@ -32,8 +32,10 @@ apt (0.8.11+wheezy) unstable; urgency=low
   * apt-inst/contrib/extracttar.cc:
     - let apt-utils work with encoded tar headers if uid/gid are large.
       Thanks to Nobuhiro Hayashi for the patch! (Closes: #330162)
+  * apt-pkg/cacheiterator.h:
+    - do not segfault if cache is not build (Closes: #254770)
 
- -- David Kalnischkies <kalnischkies@gmail.com>  Thu, 13 Jan 2011 00:25:32 +0100
+ -- David Kalnischkies <kalnischkies@gmail.com>  Thu, 13 Jan 2011 17:10:36 +0100
 
 apt (0.8.10) unstable; urgency=low
 

test/integration/test-bug-254770-segfault-if-cache-not-buildable

@@ -0,0 +1,57 @@
+#!/bin/sh
+set -e
+
+local TESTDIR=$(readlink -f $(dirname $0))
+. $TESTDIR/framework
+setupenvironment
+configarchitecture "i386"
+setupaptarchive
+
+CURRENTTRAP="chmod a+x rootdir/var/lib/dpkg; $CURRENTTRAP"
+trap "$CURRENTTRAP" 0 HUP INT QUIT ILL ABRT FPE SEGV PIPE TERM
+chmod a-x rootdir/var/lib/dpkg
+
+testsegfault() {
+	rm -f rootdir/var/cache/apt/*.bin
+	msgtest "No segfault in" "$*"
+	local TEST="$($* 2>&1 | grep -v 'E:')"
+	if [ -z "$TEST" ]; then
+		msgpass
+	else
+		echo
+		echo $TEST
+		msgfail
+	fi
+}
+
+echo 'quiet 2;' > rootdir/etc/apt/apt.conf.d/00be-quiet
+
+testsegfault aptcache gencaches
+testsegfault aptcache showpkg
+testsegfault aptcache showsrc
+testsegfault aptcache stats
+testsegfault aptcache dump
+testsegfault aptcache dumpavail
+testsegfault aptcache unmet
+testsegfault aptcache search
+testsegfault aptcache show apt
+testsegfault aptcache depends apt
+testsegfault aptcache rdepends apt
+testsegfault aptcache pkgnames apt
+testsegfault aptcache dotty apt
+testsegfault aptcache xvcg apt
+testsegfault aptcache policy apt
+
+testsegfault aptget update
+testsegfault aptget upgrade
+testsegfault aptget dselect-upgrade
+testsegfault aptget dist-upgrade
+testsegfault aptget install apt
+testsegfault aptget remove apt
+testsegfault aptget purge apt
+testsegfault aptget source apt
+testsegfault aptget build-dep apt
+testsegfault aptget check
+testsegfault aptget clean
+testsegfault aptget autoclean
+testsegfault aptget autoremove