merged from donkult

diff --git a/apt-pkg/contrib/mmap.cc b/apt-pkg/contrib/mmap.cc
index 2d12b6fe9091417440d5769a6dbe4839e8e795db..593bb063b9d0746a946a483efbaefdc7f825f8ee 100644 (file)
--- a/apt-pkg/contrib/mmap.cc
+++ b/apt-pkg/contrib/mmap.cc
@@ -83,7 +83,7 @@ bool MMap::Map(FileFd &Fd)
    {
       if ((Flags & ReadOnly) != ReadOnly)
         return _error->Error("Compressed file %s can only be mapped readonly", Fd.Name().c_str());
-      Base = new unsigned char[iSize];
+      Base = malloc(iSize);
       SyncToFd = new FileFd();
       if (Fd.Seek(0L) == false || Fd.Read(Base, iSize) == false)
         return _error->Error("Compressed file %s can't be read into mmap", Fd.Name().c_str());
@@ -91,17 +91,17 @@ bool MMap::Map(FileFd &Fd)
    }
 
    // Map it.
-   Base = mmap(0,iSize,Prot,Map,Fd.Fd(),0);
+   Base = (Flags & Fallback) ? MAP_FAILED : mmap(0,iSize,Prot,Map,Fd.Fd(),0);
    if (Base == (void *)-1)
    {
-      if (errno == ENODEV || errno == EINVAL)
+      if (errno == ENODEV || errno == EINVAL || (Flags & Fallback))
       {
         // The filesystem doesn't support this particular kind of mmap.
         // So we allocate a buffer and read the whole file into it.
         if ((Flags & ReadOnly) == ReadOnly)
         {
            // for readonly, we don't need sync, so make it simple
-           Base = new unsigned char[iSize];
+           Base = malloc(iSize);
            return Fd.Read(Base, iSize);
         }
         // FIXME: Writing to compressed fd's ?
@@ -109,7 +109,7 @@ bool MMap::Map(FileFd &Fd)
         if (dupped_fd == -1)
            return _error->Errno("mmap", _("Couldn't duplicate file descriptor %i"), Fd.Fd());
 
-        Base = new unsigned char[iSize];
+        Base = calloc(iSize, 1);
         SyncToFd = new FileFd (dupped_fd);
         if (!SyncToFd->Seek(0L) || !SyncToFd->Read(Base, iSize))
            return false;
@@ -135,7 +135,7 @@ bool MMap::Close(bool DoSync)
 
    if (SyncToFd != NULL)
    {
-      delete[] (char *)Base;
+      free(Base);
       delete SyncToFd;
       SyncToFd = NULL;
    }
@@ -283,8 +283,7 @@ DynamicMMap::DynamicMMap(unsigned long Flags,unsigned long const &WorkSpace,
        }
 #endif
        // fallback to a static allocated space
-       Base = new unsigned char[WorkSpace];
-       memset(Base,0,WorkSpace);
+       Base = calloc(WorkSpace, 1);
        iSize = 0;
 }
                                                                        /*}}}*/
@@ -300,7 +299,7 @@ DynamicMMap::~DynamicMMap()
 #ifdef _POSIX_MAPPED_FILES
       munmap(Base, WorkSpace);
 #else
-      delete [] (unsigned char *)Base;
+      free(Base);
 #endif
       return;
    }
@@ -464,6 +463,9 @@ bool DynamicMMap::Grow() {
                Base = realloc(Base, newSize);
                if (Base == NULL)
                        return false;
+               else
+                       /* Set new memory to 0 */
+                       memset((char*)Base + WorkSpace, 0, newSize - WorkSpace);
        }
 
        Pools =(Pool*) Base + poolOffset;

diff --git a/debian/changelog b/debian/changelog
index 2819158376012d22aa9ac76eeb01e9063470bc8c..20dc9d188a2eb4d23733991b36983a99bbe24723 100644 (file)
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,13 @@
+apt (0.9.7) UNRELEASED; urgency=low
+
+  * apt-pkg/contrib/mmap.cc:
+    - Fix the Fallback option to work correctly, by not calling
+      realloc() on a map mapped by mmap(), and by using malloc
+      and friends instead of new[].
+    - Zero out the new memory allocated with realloc().
+
+ -- Julian Andres Klode <jak@debian.org>  Sat, 16 Jun 2012 14:28:38 +0200
+
 apt (0.9.6.1) UNRELEASED; urgency=low
 
   [ Daniel Hartwig ]