Fix endless loop in apt-get update that can cause disk fillup

The apt http code parses Content-Length and Content-Range. For
both requests the variable "Size" is used and the semantic for
this Size is the total file size. However Content-Length is not
the entire file size for partital file requests. For servers that
send the Content-Range header first and then the Content-Length
header this can lead to globbing of Size so that its less than
the real file size. This may lead to a subsequent passing of a
negative number into the CircleBuf which leads to a endless
loop that writes data.

Thanks to Anton Blanchard for the analysis and initial patch.

LP: #1445239

3 files changed, 18 insertions, 7 deletions

diff --git a/methods/http.cc b/methods/http.cc
index 1b996db98..ad90c9891 100644
--- a/methods/http.cc
+++ b/methods/http.cc
@@ -443,7 +443,7 @@ bool HttpServerState::RunData(FileFd * const File)
       else if (JunkSize != 0)
 	 In.Limit(JunkSize);
       else
-	 In.Limit(Size - StartPos);
+	 In.Limit(DownloadSize);
       
       // Just transfer the whole block.
       do
diff --git a/methods/server.cc b/methods/server.cc
index e321e0230..ba0a8864b 100644
--- a/methods/server.cc
+++ b/methods/server.cc
@@ -164,15 +164,22 @@ bool ServerState::HeaderLine(string Line)
 	 Encoding = Stream;
       HaveContent = true;
 
-      unsigned long long * SizePtr = &Size;
+      unsigned long long * DownloadSizePtr = &DownloadSize;
       if (Result == 416)
-	 SizePtr = &JunkSize;
+	 DownloadSizePtr = &JunkSize;
 
-      *SizePtr = strtoull(Val.c_str(), NULL, 10);
-      if (*SizePtr >= std::numeric_limits<unsigned long long>::max())
+      *DownloadSizePtr = strtoull(Val.c_str(), NULL, 10);
+      if (*DownloadSizePtr >= std::numeric_limits<unsigned long long>::max())
 	 return _error->Errno("HeaderLine", _("The HTTP server sent an invalid Content-Length header"));
-      else if (*SizePtr == 0)
+      else if (*DownloadSizePtr == 0)
 	 HaveContent = false;
+
+      // On partial content (206) the Content-Length less than the real
+      // size, so do not set it here but leave that to the Content-Range
+      // header instead
+      if(Result != 206 && Size == 0)
+         Size = DownloadSize;
+
       return true;
    }
 
@@ -193,6 +200,9 @@ bool ServerState::HeaderLine(string Line)
 	 return _error->Error(_("The HTTP server sent an invalid Content-Range header"));
       if ((unsigned long long)StartPos > Size)
 	 return _error->Error(_("This HTTP server has broken range support"));
+
+      // figure out what we will download
+      DownloadSize = Size - StartPos;
       return true;
    }
 
diff --git a/methods/server.h b/methods/server.h
index 1b81e3549..ed3cb456a 100644
--- a/methods/server.h
+++ b/methods/server.h
@@ -34,7 +34,8 @@ struct ServerState
    char Code[360];
 
    // These are some statistics from the last parsed header lines
-   unsigned long long Size; // size of the usable content (aka: the file)
+   unsigned long long Size; // total size of the usable content (aka: the file)
+   unsigned long long DownloadSize; // size we actually download (can be smaller than Size if we have partial content)
    unsigned long long JunkSize; // size of junk content (aka: server error pages)
    unsigned long long StartPos;
    time_t Date;