[PATCH] drm/vkms: off by one in vkms_gem_fault()

[Rodrigo Siqueira]

Hi Dan,

Thanks for your patch. I checked and tested it, everything is fine.

On 07/14, Dan Carpenter wrote:
> The > should be >= so that we don't read one page beyond the end of the
> obj->pages[] array.
> 
> Fixes: 559e50fd34d1 ("drm/vkms: Add dumb operations")
> Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
> 
> diff --git a/drivers/gpu/drm/vkms/vkms_gem.c b/drivers/gpu/drm/vkms/vkms_gem.c
> index c7e38368602b..2cca8c2f260f 100644
> --- a/drivers/gpu/drm/vkms/vkms_gem.c
> +++ b/drivers/gpu/drm/vkms/vkms_gem.c
> @@ -55,7 +55,7 @@ int vkms_gem_fault(struct vm_fault *vmf)
>  	page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT;
>  	num_pages = DIV_ROUND_UP(obj->gem.size, PAGE_SIZE);
>  
> -	if (page_offset > num_pages)
> +	if (page_offset >= num_pages)
>  		return VM_FAULT_SIGBUS;
>  
>  	ret = -ENOENT;

Reviewed-by: Rodrigo Siqueira <rodrigosiqueiramelo at gmail.com>