Re: [dpdk-dev] [EXT] [PATCH] crypto: fix heap use after free bug

[Akhil Goyal <gakhil@marvell.com>]

Fixed title
Cryptodev: fix heap use after free
> > The PMD destroy function was calling the release function, which frees
> > cryptodev->data, and then tries to free cryptodev->data->dev_private,
> > which causes the heap use after free issue.
> >
> > A temporary pointer is set before the free of cryptodev->data,
> > which can then be used afterwards to free dev_private.
> > The free cannot be moved to before the release function is called,
> > as dev_private is used in the QAT close function while being released.
I believe all PMDs use dev_private for close.
Hence replaces QAT with PMD
> >
> > Fixes: 9e6edea41805 ("cryptodev: add APIs to assist PMD initialisation")
> > Cc: declan.doherty@intel.com
> > Cc: stable@dpdk.org
> >
> > Reported-by: ZhihongX Peng <zhihongx.peng@intel.com>
> > Signed-off-by: Ciara Power <ciara.power@intel.com>
> >
> > ---
> > The same issue is found in crypto/octeontx,
> > which may need to be addressed by maintainers.
> > Cc: Anoob Joseph <anoobj@marvell.com>
> > ---
> >  lib/cryptodev/rte_cryptodev_pmd.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/lib/cryptodev/rte_cryptodev_pmd.c
> > b/lib/cryptodev/rte_cryptodev_pmd.c
> > index 0912004127..900acd7ba4 100644
> > --- a/lib/cryptodev/rte_cryptodev_pmd.c
> > +++ b/lib/cryptodev/rte_cryptodev_pmd.c
> > @@ -140,6 +140,7 @@ int
> >  rte_cryptodev_pmd_destroy(struct rte_cryptodev *cryptodev)
> >  {
> >  	int retval;
> > +	void *tmp_dev_private = cryptodev->data->dev_private;
> 
> Can we rename this pointer as dev_private?

Renamed this while merging, as we have RC3 deadline today.
> 
> >
> >  	CDEV_LOG_INFO("Closing crypto device %s", cryptodev->device-
> > >name);
> >
> > @@ -149,7 +150,7 @@ rte_cryptodev_pmd_destroy(struct rte_cryptodev
> > *cryptodev)
> >  		return retval;
> >
> >  	if (rte_eal_process_type() == RTE_PROC_PRIMARY)
> > -		rte_free(cryptodev->data->dev_private);
> > +		rte_free(tmp_dev_private);
> >
> >
> >  	cryptodev->device = NULL;
> > --
> > 2.25.1