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

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Message-ID: <CADnq5_Ni9T-jkLrv-s-v1VD8J=VQmyz6S43Na52=1sjdB-uJZA@mail.gmail.com>
Date:   Tue, 23 Jul 2019 14:55:12 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Zhou <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>, kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] drm/amd/display: fix a missing null check on a
 failed kzalloc

On Tue, Jul 23, 2019 at 10:23 AM Colin King <colin.king@...onical.com> wrote:
>
> From: Colin Ian King <colin.king@...onical.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@...onical.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
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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