linux-kernel - Re: [PATCH] mtd: rawnand: atmel: Unmap streaming DMA mappings

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <81db99e7-d97e-893a-16dd-3b13138b2720@microchip.com>
Date:   Tue, 2 Aug 2022 11:03:32 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <peda@...ntia.se>
CC:     <Nicolas.Ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <Claudiu.Beznea@...rochip.com>, <bbrezillon@...nel.org>,
        <linux-mtd@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH] mtd: rawnand: atmel: Unmap streaming DMA mappings

On 7/28/22 10:40, Tudor Ambarus wrote:
> Every dma_map_single() call should have its dma_unmap_single() counterpart,
> because the DMA address space is a shared resource and one could render the
> machine unusable by consuming all DMA addresses.
> 
> Cc: stable@...r.kernel.org
> Fixes: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver")

Reported-by: Peter Rosin <peda@...ntia.se>

> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---
>  drivers/mtd/nand/raw/atmel/nand-controller.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
> index 6ef14442c71a..330d2dafdd2d 100644
> --- a/drivers/mtd/nand/raw/atmel/nand-controller.c
> +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
> @@ -405,6 +405,7 @@ static int atmel_nand_dma_transfer(struct atmel_nand_controller *nc,
>  
>  	dma_async_issue_pending(nc->dmac);
>  	wait_for_completion(&finished);
> +	dma_unmap_single(nc->dev, buf_dma, len, dir);
>  
>  	return 0;
>  


-- 
Cheers,
ta