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From: Ciara Power <ciara.power@intel.com>
To: dev@dpdk.org
Cc: gakhil@marvell.com, roy.fan.zhang@intel.com,
	Ciara Power <ciara.power@intel.com>,
	declan.doherty@intel.com, stable@dpdk.org,
	ZhihongX Peng <zhihongx.peng@intel.com>,
	Anoob Joseph <anoobj@marvell.com>
Subject: [dpdk-dev] [PATCH] crypto: fix heap use after free bug
Date: Wed, 21 Jul 2021 12:51:22 +0000	[thread overview]
Message-ID: <20210721125122.185019-1-ciara.power@intel.com> (raw)

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.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;
 
 	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


             reply	other threads:[~2021-07-21 12:51 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-21 12:51 Ciara Power [this message]
2021-07-27 18:04 ` [dpdk-dev] [EXT] " Akhil Goyal
2021-07-30 19:10   ` Akhil Goyal
2021-07-30 19:11     ` Akhil Goyal

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