Hi Mark,
> Subject: [PATCH] regmap: fix possible ZERO_SIZE_PTR pointer dereferencing
> error.
>
> Since we cannot make sure the 'val_count' will always be none zero
> here, and then if it equals to zero, the kmemdup() will return
> ZERO_SIZE_PTR, which equals to ((void *)16).
>
> So this patch fix this with just doing the zero check before calling
> kmemdup().
>
> Signed-off-by: Xiubo Li <li.xi...@freescale.com>
> ---
> drivers/base/regmap/regmap.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
> index 455a877..3d93e38 100644
> --- a/drivers/base/regmap/regmap.c
> +++ b/drivers/base/regmap/regmap.c
> @@ -1716,6 +1716,9 @@ out:
> } else {
> void *wval;
>
> + if (!val_count)
> + return -EINVAL;
> +
Should it return zero as success or just return -EINVAL for error here ?
If it allow zero of val_count in regmap_bulk_write(..., val_count) could do
Nothing and just return zero as success at the beginning of it.
I will respin this patch if return zero is better ...
Thanks,
BRs
Xiubo
> wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
> if (!wval) {
> dev_err(map->dev, "Error in memory allocation\n");
> --
> 2.1.0.27.g96db324
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