Bug 560171 - nsDiskCacheStreamIO::Write leaks mBuffer on realloc failure, r=biesi

--HG--
extra : rebase_source : ab53e9aa6bbd9616b412bd82d3556157f6c80abd

netwerk/cache/src/nsDiskCacheStreams.cpp

@@ -578,8 +578,11 @@ nsDiskCacheStreamIO::Write( const char * buffer,
         if (mBufPos == mBufSize) {
             if (mBufSize < kMaxBufferSize) {
                 mBufSize = kMaxBufferSize;
+                char *buffer = mBuffer;
+
                 mBuffer  = (char *) realloc(mBuffer, mBufSize);
-                if (!mBuffer)  {
+                if (!mBuffer) {
+                    free(buffer);
                     mBufSize = 0;
                     break;
                 }