Re: [PATCH 1/1] staging: ion: Prevent incorrect reference counting behavour

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On Thu, Nov 25, 2021 at 12:02:34PM +0000, Lee Jones wrote:
> Supply additional checks in order to prevent unexpected results.
> 
> Fixes: b892bf75b2034 ("ion: Switch ion to use dma-buf")
> Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
> ---
>  drivers/staging/android/ion/ion.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
> index 806e9b30b9dc8..30f359faba575 100644
> --- a/drivers/staging/android/ion/ion.c
> +++ b/drivers/staging/android/ion/ion.c
> @@ -509,6 +509,9 @@ static void *ion_handle_kmap_get(struct ion_handle *handle)
>  	void *vaddr;
>  
>  	if (handle->kmap_cnt) {
> +		if (handle->kmap_cnt + 1 < handle->kmap_cnt)

What about using the nice helpers in overflow.h for this?

> +			return ERR_PTR(-EOVERFLOW);
> +
>  		handle->kmap_cnt++;
>  		return buffer->vaddr;
>  	}
> -- 
> 2.34.0.rc2.393.gf8c9666880-goog

What stable kernel branch(es) is this for?

thanks,

greg k-h



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