From: marek.vasut@gmail•com (Marek Vasut)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] pxa2xx_spi: fix memory corruption
Date: Sun, 10 Jul 2011 01:05:48 +0200 [thread overview]
Message-ID: <201107100105.48168.marek.vasut@gmail.com> (raw)
In-Reply-To: <1310246098-21208-1-git-send-email-anarsoul@gmail.com>
On Saturday, July 09, 2011 11:14:58 PM Vasily Khoruzhick wrote:
> pxa2xx_spi_probe allocates struct driver_data and null_dma_buf
> at same time via spi_alloc_master(), but then calculates
> null_dma_buf pointer incorrectly, and it causes memory corruption
> later if DMA usage is enabled.
>
> Signed-off-by: Vasily Khoruzhick <anarsoul@gmail•com>
> ---
> drivers/spi/pxa2xx_spi.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
> index dc25bee..ef38fbf 100644
> --- a/drivers/spi/pxa2xx_spi.c
> +++ b/drivers/spi/pxa2xx_spi.c
> @@ -1569,7 +1569,7 @@ static int __devinit pxa2xx_spi_probe(struct
> platform_device *pdev) master->transfer = transfer;
>
> drv_data->ssp_type = ssp->type;
> - drv_data->null_dma_buf = (u32 *)ALIGN((u32)(drv_data +
> + drv_data->null_dma_buf = (u32 *)ALIGN(((u32)drv_data +
> sizeof(struct driver_data)), 8);
This thing looks a bit disturbing in itself. Like, where the heck is that thing
pointing in the end ? Since some data are written to address in "null_dma_buf"
... isn't this just changing the corruption impact ?
>
> drv_data->ioaddr = ssp->mmio_base;
next prev parent reply other threads:[~2011-07-09 23:05 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-09 21:14 [PATCH] pxa2xx_spi: fix memory corruption Vasily Khoruzhick
2011-07-09 23:05 ` Marek Vasut [this message]
2011-07-09 23:11 ` Russell King - ARM Linux
2011-07-10 7:14 ` Marek Vasut
2011-07-10 7:57 ` Marek Vasut
2011-07-10 12:09 ` [PATCH v2] " Vasily Khoruzhick
2011-07-10 12:43 ` Marek Vasut
2011-07-10 13:09 ` Vasily Khoruzhick
2011-07-10 15:18 ` [PATCH v3] " Vasily Khoruzhick
2011-07-14 12:17 ` Vasily Khoruzhick
2011-07-14 12:21 ` Marek Vasut
2011-07-15 2:53 ` Grant Likely
2011-07-15 8:12 ` Russell King - ARM Linux
2011-07-15 19:50 ` Grant Likely
2011-07-15 20:24 ` Russell King - ARM Linux
2011-07-15 21:31 ` Grant Likely
2011-07-18 10:10 ` Russell King - ARM Linux
2011-07-18 7:56 ` Vasily Khoruzhick
2011-11-29 14:05 ` Vasily Khoruzhick
2011-11-29 14:31 ` Marek Vasut
2011-12-07 20:35 ` Wolfram Sang
2011-12-08 8:19 ` [RESEND PATCH " Vasily Khoruzhick
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