Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752202AbaBTKDe (ORCPT ); Thu, 20 Feb 2014 05:03:34 -0500 Received: from ns.mm-sol.com ([37.157.136.199]:35409 "EHLO extserv.mm-sol.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751777AbaBTKDc (ORCPT ); Thu, 20 Feb 2014 05:03:32 -0500 From: "Ivan T. Ivanov" To: Mark Brown Cc: "Ivan T. Ivanov" , Gerhard Sittig , linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3] spi: core: Validate length of the transfers in message Date: Thu, 20 Feb 2014 12:02:08 +0200 Message-Id: <1392890528-7417-1-git-send-email-iivanov@mm-sol.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Ivan T. Ivanov" SPI transfer length should be multiple of SPI word size, where SPI word size should be power-of-two multiple Signed-off-by: Ivan T. Ivanov --- drivers/spi/spi.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index d0b28bb..45b1610 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1617,6 +1617,7 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message) { struct spi_master *master = spi->master; struct spi_transfer *xfer; + int w_size, n_words; if (list_empty(&message->transfers)) return -EINVAL; @@ -1668,6 +1669,22 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message) return -EINVAL; } + /* + * SPI transfer length should be multiple of SPI word size + * where SPI word size should be power-of-two multiple + */ + if (xfer->bits_per_word <= 8) + w_size = 1; + else if (xfer->bits_per_word <= 16) + w_size = 2; + else + w_size = 4; + + n_words = xfer->len / w_size; + /* No partial transfers accepted */ + if (!n_words || xfer->len % w_size) + return -EINVAL; + if (xfer->speed_hz && master->min_speed_hz && xfer->speed_hz < master->min_speed_hz) return -EINVAL; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/