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

[Ciara Power]

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.

Fixes: 9e6edea41805 ("cryptodev: add APIs to assist PMD initialisation")
Cc: declan.dohe...@intel.com
Cc: sta...@dpdk.org

Reported-by: ZhihongX Peng <zhihongx.p...@intel.com>
Signed-off-by: Ciara Power <ciara.po...@intel.com>

---
The same issue is found in crypto/octeontx,
which may need to be addressed by maintainers.
Cc: Anoob Joseph <ano...@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;
 
        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