Re: [PATCH] vc04_services: vchiq_arm: fix a NULL pointer dereference

[Mukesh Ojha]

On 3/25/2019 4:13 AM, Kangjie Lu wrote:
> When kzalloc fails, "platform_state->inited = 1" is a NULL pointer
> dereference. The fix returns VCHIQ_ERROR in case it failed to
> avoid NULL pointer dereference.
>
> Signed-off-by: Kangjie Lu <kjlu@xxxxxxx>


Reviewed-by: Mukesh Ojha <mojha@xxxxxxxxxxxxxx>

-Mukesh

> ---
>   .../staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c  | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
> index dd4898861b83..0f12fe617575 100644
> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
> @@ -209,6 +209,8 @@ vchiq_platform_init_state(struct vchiq_state *state)
>   	struct vchiq_2835_state *platform_state;
>   
>   	state->platform_state = kzalloc(sizeof(*platform_state), GFP_KERNEL);
> +	if (!state->platform_state)
> +		return VCHIQ_ERROR;
>   	platform_state = (struct vchiq_2835_state *)state->platform_state;
>   
>   	platform_state->inited = 1;