Bug 712277 - Avoid crash in zlib adler32 following compression failure; r=michal.novotny

netwerk/cache/nsCacheEntryDescriptor.cpp

@@ -915,6 +915,8 @@ nsCompressOutputStreamWrapper::Write(const char * buf,
     while (mZstream.avail_in > 0) {
         zerr = deflate(&mZstream, Z_NO_FLUSH);
         if (zerr == Z_STREAM_ERROR) {
+            deflateEnd(&mZstream);
+            mStreamInitialized = PR_FALSE;
             return NS_ERROR_FAILURE;
         }
         // Note: Z_BUF_ERROR is non-fatal and sometimes expected here.
@@ -924,6 +926,8 @@ nsCompressOutputStreamWrapper::Write(const char * buf,
         if (mZstream.avail_out == 0) {
             rv = WriteBuffer();
             if (NS_FAILED(rv)) {
+                deflateEnd(&mZstream);
+                mStreamInitialized = PR_FALSE;
                 return rv;
             }
         }