[PATCH] drm/brige/megachips: Add checking if ge_b850v3_lvds_init() is working correctly

[Sam Ravnborg]

Hi Nadezda

On Wed, Aug 19, 2020 at 05:37:56PM +0300, Nadezda Lutovinova wrote:
> If ge_b850v3_lvds_init() does not allocate memory for ge_b850v3_lvds_ptr,
> then a null pointer dereference is accessed.
> 
> The patch adds checking of the return value of ge_b850v3_lvds_init().
> 
> Found by Linux Driver Verification project (linuxtesting.org).
> 
> Signed-off-by: Nadezda Lutovinova <lutovinova at ispras.ru>

Thanks, applied to drm-misc-next, so it will hit upstream during the
next merge window.

	Sam

> ---
>  drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
> index 6200f12..ab81748 100644
> --- a/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
> +++ b/drivers/gpu/drm/bridge/megachips-stdpxxxx-ge-b850v3-fw.c
> @@ -302,8 +302,12 @@ static int stdp4028_ge_b850v3_fw_probe(struct i2c_client *stdp4028_i2c,
>  				       const struct i2c_device_id *id)
>  {
>  	struct device *dev = &stdp4028_i2c->dev;
> +	int ret;
> +
> +	ret = ge_b850v3_lvds_init(dev);
>  
> -	ge_b850v3_lvds_init(dev);
> +	if (ret)
> +		return ret;
>  
>  	ge_b850v3_lvds_ptr->stdp4028_i2c = stdp4028_i2c;
>  	i2c_set_clientdata(stdp4028_i2c, ge_b850v3_lvds_ptr);
> @@ -361,8 +365,12 @@ static int stdp2690_ge_b850v3_fw_probe(struct i2c_client *stdp2690_i2c,
>  				       const struct i2c_device_id *id)
>  {
>  	struct device *dev = &stdp2690_i2c->dev;
> +	int ret;
> +
> +	ret = ge_b850v3_lvds_init(dev);
>  
> -	ge_b850v3_lvds_init(dev);
> +	if (ret)
> +		return ret;
>  
>  	ge_b850v3_lvds_ptr->stdp2690_i2c = stdp2690_i2c;
>  	i2c_set_clientdata(stdp2690_i2c, ge_b850v3_lvds_ptr);
> -- 
> 1.9.1
> 
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