linux-kernel - [PATCH] s390/vfio-ap: Fix memory allocation for mdev

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Date:   Fri, 21 Oct 2022 10:59:05 -0400
From:   "Jason J. Herne" <jjherne@...ux.ibm.com>
To:     linux-s390@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] s390/vfio-ap: Fix memory allocation for mdev_types array

The vfio-ap crypto driver fails to allocate memory for an array of
pointers used to pass supported mdev types to mdev_register_parent().

Since we only support a single mdev type, the fix is to allocate a
single entry in the ap_matrix_dev->mdev_types array.

Fixes: 63e685747784 ("s390: vfio-ap: base implementation of VFIO AP device driver")
Cc: stable@...r.kernel.org
Cc: Tony Krowiak <akrowiak@...ux.ibm.com>
Reported-by: Christian Borntraeger <borntraeger@...ux.ibm.com>
Signed-off-by: Jason J. Herne <jjherne@...ux.ibm.com>
---
 drivers/s390/crypto/vfio_ap_private.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
index 2eddd5f34ed3..976a65f32e7d 100644
--- a/drivers/s390/crypto/vfio_ap_private.h
+++ b/drivers/s390/crypto/vfio_ap_private.h
@@ -52,7 +52,7 @@ struct ap_matrix_dev {
 	struct mutex guests_lock; /* serializes access to each KVM guest */
 	struct mdev_parent parent;
 	struct mdev_type mdev_type;
-	struct mdev_type *mdev_types[];
+	struct mdev_type *mdev_types[1];
 };

 extern struct ap_matrix_dev *matrix_dev;
-- 
2.37.3