long jas_stream_seek(jas_stream_t *stream, long offset, int origin)
{
	long newpos;

	/* The buffer cannot be in use for both reading and writing. */
	assert(!((stream->bufmode_ & JAS_STREAM_RDBUF) && (stream->bufmode_ &
	  JAS_STREAM_WRBUF)));

	/* Reset the EOF indicator (since we may not be at the EOF anymore). */
	stream->flags_ &= ~JAS_STREAM_EOF;

	if (stream->bufmode_ & JAS_STREAM_RDBUF) {
		if (origin == SEEK_CUR) {
			offset -= stream->cnt_;
		}
	} else if (stream->bufmode_ & JAS_STREAM_WRBUF) {
		if (jas_stream_flush(stream)) {
			return -1;
		}
	}
	stream->cnt_ = 0;
	stream->ptr_ = stream->bufstart_;
	stream->bufmode_ &= ~(JAS_STREAM_RDBUF | JAS_STREAM_WRBUF);

	if ((newpos = (*stream->ops_->seek_)(stream->obj_, offset, origin))
	  < 0) {
		return -1;
	}

	return newpos;
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.