[PATCH][next] drm/amd/display: fix a missing null check on a failed kzalloc

[Alex Deucher]

On Tue, Jul 23, 2019 at 10:23 AM Colin King <colin.king at canonical.com> wrote:
>
> From: Colin Ian King <colin.king at canonical.com>
>
> Currently the allocation of config may fail and a null pointer
> dereference on config can occur.  Fix this by added a null
> check on a failed allocation of config.
>
> Addresses-Coverity: ("Dereference null return")
> Fixes: c2cd9d04ecf0 ("drm/amd/display: Hook up calls to do stereo mux and dig programming to stereo control interface")
> Signed-off-by: Colin Ian King <colin.king at canonical.com>

Applied.  thanks!

Alex

> ---
>  drivers/gpu/drm/amd/display/dc/core/dc.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
> index 168f4a7dffdf..7cce2baec2af 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
> @@ -1259,6 +1259,8 @@ bool dc_set_generic_gpio_for_stereo(bool enable,
>         struct gpio_generic_mux_config *config = kzalloc(sizeof(struct gpio_generic_mux_config),
>                            GFP_KERNEL);
>
> +       if (!config)
> +               return false;
>         pin_info = dal_gpio_get_generic_pin_info(gpio_service, GPIO_ID_GENERIC, 0);
>
>         if (pin_info.mask == 0xFFFFFFFF || pin_info.offset == 0xFFFFFFFF) {
> --
> 2.20.1
>
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