fix

--HG--
branch : HEAD

diff --git a/src/lib-index/mbox/istream-mbox.c b/src/lib-index/mbox/istream-mbox.c
index 2a7995fac43e22c86932366942fc828b3af38506..9d1c57b8d81e24376493a8c6f13ddc8846c38ba8 100644 (file)
--- a/src/lib-index/mbox/istream-mbox.c
+++ b/src/lib-index/mbox/istream-mbox.c
@@ -78,10 +78,10 @@ static ssize_t _read(struct _istream *stream)
        mstream->istream.skip = 0;
        mstream->istream.buffer = i_stream_get_data(mstream->input, &pos);
 
-       if (pos == mstream->istream.pos)
+       if (pos <= mstream->istream.pos)
                ret = -1;
        else {
-               ret = mstream->istream.pos - pos;
+               ret = pos - mstream->istream.pos;
                 mstream->istream.pos = pos;
        }