linux-kernel - Re: [PATCH for-next] spi: bcm53xx: add spi_flash

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Date:	Mon, 18 Apr 2016 12:24:57 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Rafał Miłecki <zajec5@...il.com>
Cc:	"open list:SPI SUBSYSTEM" <linux-spi@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH for-next] spi: bcm53xx: add spi_flash_read callback for
 MMIO-based reads

On Mon, Apr 18, 2016 at 01:10:43PM +0200, Rafał Miłecki wrote:

> +static int bcm53xxspi_flash_read(struct spi_device *spi,
> +				 struct spi_flash_read_message *msg)
> +{
> +	struct bcm53xxspi *b53spi = spi_master_get_devdata(spi->master);
> +	int ret = 0;
> +
> +	bcm53xxspi_enable_bspi(b53spi);
> +	memcpy_fromio(msg->buf, b53spi->mmio_base + msg->from, msg->len);
> +	msg->retlen = msg->len;

There's no bounds check here but...

> +	if (core->addr_s[0])
> +		b53spi->mmio_base = devm_ioremap(dev, core->addr_s[0], SZ_32M);

...we only mapped 32M here.  What if something tries to do a larger
read?  It's also a bit surprising that we're mapping a specific size
here rather than the entire resource.

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