On Wed, Sep 09, 2020 at 08:53:50PM +0100, Alex Dewar wrote:
> In the file pci/sh_css_params.c, there are a number of places where
> memset+kvfree is used, where kvfree_sensitive could be used instead. Fix
> these occurrences.
This doesn't say *why* the commit is doing it. There are two reasons:
The worry with these is that the compiler could optimize away the memset
because it sees the kfree(). Second using kvfree_sensitive() is more
clear and readable.
>
> Issue identified with Coccinelle.
>
> Signed-off-by: Alex Dewar <alex.dewa...@gmail.com>
> ---
> .../staging/media/atomisp/pci/sh_css_params.c | 19 +++++++------------
> 1 file changed, 7 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/staging/media/atomisp/pci/sh_css_params.c
> b/drivers/staging/media/atomisp/pci/sh_css_params.c
> index 2c67c23b3700..d1b5d6608d52 100644
> --- a/drivers/staging/media/atomisp/pci/sh_css_params.c
> +++ b/drivers/staging/media/atomisp/pci/sh_css_params.c
> @@ -4378,8 +4378,7 @@ ia_css_3a_statistics_free(struct ia_css_3a_statistics
> *me)
> if (me) {
> kvfree(me->rgby_data);
> kvfree(me->data);
> - memset(me, 0, sizeof(struct ia_css_3a_statistics));
> - kvfree(me);
> + kvfree_sensitive(me, sizeof(struct ia_css_3a_statistics));
I don't think ia_css_3a_statistics are sensitive at all. What we're
trying to protect are things like passwords. Just delete the memset.
Looking below, I don't think any of these are sensitive so just delete
all the memsets.
regards,
dan carpenter
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