linux-kernel - [PATCH] nitrox: avoid double free on error path in nitrox_sriov

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Date:   Wed, 28 Sep 2022 13:25:05 +0300
From:   Natalia Petrova <n.petrova@...tech.ru>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
CC:     Natalia Petrova <n.petrova@...tech.ru>,
        <linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <ldv-project@...uxtesting.org>,
        "Alexey Khoroshilov" <khoroshilov@...ras.ru>
Subject: [PATCH] nitrox: avoid double free on error path in nitrox_sriov_init()

If alloc_workqueue() fails in nitrox_mbox_init() it deallocates
ndev->iov.vfdev and returns error code, but then nitrox_sriov_init()
calls nitrox_sriov_cleanup() where ndev->iov.vfdev is deallocated
again.

Fix this by nulling ndev->iov.vfdev after the first deallocation.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Natalia Petrova <n.petrova@...tech.ru>
Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/crypto/cavium/nitrox/nitrox_mbx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/crypto/cavium/nitrox/nitrox_mbx.c b/drivers/crypto/cavium/nitrox/nitrox_mbx.c
index 9e7308e39b30..d4e06999af9b 100644
--- a/drivers/crypto/cavium/nitrox/nitrox_mbx.c
+++ b/drivers/crypto/cavium/nitrox/nitrox_mbx.c
@@ -195,6 +195,7 @@ int nitrox_mbox_init(struct nitrox_device *ndev)
 	ndev->iov.pf2vf_wq = alloc_workqueue("nitrox_pf2vf", 0, 0);
 	if (!ndev->iov.pf2vf_wq) {
 		kfree(ndev->iov.vfdev);
+		ndev->iov.vfdev = NULL;
 		return -ENOMEM;
 	}
 	/* enable pf2vf mailbox interrupts */
-- 
2.34.1