On Sun, Feb 28, 2021 at 08:07:05PM +0100, Ahmad Fatoum wrote:
> Until this is fixed, add a comment and have the driver return with an
> error instead of crashing on null pointer dereference if it's mapped to
> zero.
>
> Signed-off-by: Ahmad Fatoum <ahmad@xxxxxx>
> ---
> Cc: Rouven Czerwinski <r.czerwinski@xxxxxxxxxxxxxx>
> ---
> drivers/mtd/nor/cfi_flash.c | 4 ++++
> 1 file changed, 4 insertions(+)
Applied, thanks
Sascha
>
> diff --git a/drivers/mtd/nor/cfi_flash.c b/drivers/mtd/nor/cfi_flash.c
> index 225b03ec3d23..ba0bd1b4ebdd 100644
> --- a/drivers/mtd/nor/cfi_flash.c
> +++ b/drivers/mtd/nor/cfi_flash.c
> @@ -969,6 +969,10 @@ static int cfi_probe_one(struct flash_info *info, int num)
> return PTR_ERR(iores);
> info->base = IOMEM(iores->start);
>
> + /* TODO: either remap memory region or disable NULL pointer page */
> + if (IS_ENABLED(CONFIG_MMU) && iores->start == 0)
> + return -EPERM;
> +
> ret = flash_detect_size(info);
> if (ret) {
> dev_warn(info->dev, "## Unknown FLASH on Bank at 0x%p - Size = 0x%08lx = %ld MB\n",
> --
> 2.30.0
>
>
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