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 <[email protected]>
> ---
> 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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