crypto: nitrox - avoid double free on error path in nitrox_sriov_init()

[ Upstream commit 094528b6a5a755b1195a01e10b13597d67d1a0e6 ]

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.

Fixes: 9e5de3e06e54 ("crypto: cavium/nitrox - Add mailbox...")
Signed-off-by: Natalia Petrova <n.petrova@fintech.ru>
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/crypto/cavium/nitrox/nitrox_mbx.c b/drivers/crypto/cavium/nitrox/nitrox_mbx.c
index 9e7308e..d4e0699 100644 (file)
--- 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 */