linux-kernel - [PATCH] scsi/virio_scsi.c: do not call virtscsi_remove_vqs() in virtscsi

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Date:   Thu, 23 Aug 2018 10:24:58 +0800
From:   piaojun <piaojun@...wei.com>
To:     <stefanha@...ux.vnet.ibm.com>, <pbonzini@...hat.com>
CC:     <linux-kernel@...r.kernel.org>, <rusty@...tcorp.com.au>,
        <kvm@...r.kernel.org>, <penberg@...nel.org>, <mst@...hat.com>,
        <stefanha@...ux.vnet.ibm.com>, <michaelc@...wisc.edu>
Subject: [PATCH] scsi/virio_scsi.c: do not call virtscsi_remove_vqs() in
 virtscsi_init() to avoid crash bug

If some error happened before find_vqs, error branch will goto
virtscsi_remove_vqs to free vqs. Actually the vqs have not been allocated
successfully, so this will cause wild-pointer-free problem. So
virtscsi_remove_vqs could be deleted as no error will happen after
find_vqs.

Signed-off-by: Jun Piao <piaojun@...wei.com>
---
 drivers/scsi/virtio_scsi.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 1c72db9..da0fd74 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -833,8 +833,6 @@ static int virtscsi_init(struct virtio_device *vdev,
 	kfree(names);
 	kfree(callbacks);
 	kfree(vqs);
-	if (err)
-		virtscsi_remove_vqs(vdev);
 	return err;
 }

--