On Thu, Jan 06, 2022 at 05:22:57PM +0800, Jiasheng Jiang wrote:
> As the possible failure of the allocation, the devm_ioremap() may return
> NULL pointer.
> Then the kpspi->base is assigned to cs->base in kp_spi_setup() and used
> in kp_spi_read_reg() and kp_spi_write_reg().
> Therefore, it should be better to add the sanity check and return error
> in order to avoid the dereference of the NULL pointer.
>
> Fixes: 677b993a5749 ("staging: kpc2000: kpc_spi: use devm_* API to manage mapped I/O space")
> Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
> ---
> drivers/staging/kpc2000/kpc2000_spi.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/staging/kpc2000/kpc2000_spi.c b/drivers/staging/kpc2000/kpc2000_spi.c
> index 16ca18b8aa15..ead4aa0c988c 100644
> --- a/drivers/staging/kpc2000/kpc2000_spi.c
> +++ b/drivers/staging/kpc2000/kpc2000_spi.c
> @@ -466,6 +466,10 @@ kp_spi_probe(struct platform_device *pldev)
>
> kpspi->base = devm_ioremap(&pldev->dev, r->start,
> resource_size(r));
> + if (!kpspi->base) {
> + status = -ENOMEM;
> + goto free_master;
> + }
>
> status = spi_register_master(master);
> if (status < 0) {
> --
> 2.25.1
>
>
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
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