i_stream_read(): Added assert.

diff --git a/src/lib/istream.c b/src/lib/istream.c
index f17d7a2a23e141a3fe27ca4b4f86c908dc9f1cf9..bd42094296550be97daaf4764578626db67047a3 100644 (file)
--- a/src/lib/istream.c
+++ b/src/lib/istream.c
@@ -133,6 +133,7 @@ ssize_t i_stream_read(struct istream *stream)
 
        old_size = _stream->pos - _stream->skip;
        ret = _stream->read(_stream);
+       i_assert(old_size <= _stream->pos - _stream->skip);
        switch (ret) {
        case -2:
                i_assert(_stream->skip != _stream->pos);