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scsi: virtio_scsi: fix handling of kmalloc failure

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There is no check about the return value of kmalloc in
virtscsi_rescan_hotunplug. Add the check to avoid use
of null pointer 'inq_result' in case of the failure
of kmalloc.

Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Message-Id: <20230202064124.22277-1-zyytlz.wz@163.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zheng Wang 2023-02-02 14:41:24 +08:00 committed by Michael S. Tsirkin
parent 699209fcc5
commit 08707b5c33
1 changed files with 12 additions and 2 deletions
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14
drivers/scsi/virtio_scsi.c
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@ -330,7 +330,7 @@ static void virtscsi_handle_param_change(struct virtio_scsi *vscsi,
scsi_device_put(sdev);
}
static void virtscsi_rescan_hotunplug(struct virtio_scsi *vscsi)
static int virtscsi_rescan_hotunplug(struct virtio_scsi *vscsi)
{
struct scsi_device *sdev;
struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
@ -338,6 +338,11 @@ static void virtscsi_rescan_hotunplug(struct virtio_scsi *vscsi)
int result, inquiry_len, inq_result_len = 256;
char *inq_result = kmalloc(inq_result_len, GFP_KERNEL);
if (!inq_result) {
kfree(inq_result);
return -ENOMEM;
}
shost_for_each_device(sdev, shost) {
inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
@ -366,6 +371,7 @@ static void virtscsi_rescan_hotunplug(struct virtio_scsi *vscsi)
}
kfree(inq_result);
return 0;
}
static void virtscsi_handle_event(struct work_struct *work)
@ -377,9 +383,13 @@ static void virtscsi_handle_event(struct work_struct *work)
if (event->event &
cpu_to_virtio32(vscsi->vdev, VIRTIO_SCSI_T_EVENTS_MISSED)) {
int ret;
event->event &= ~cpu_to_virtio32(vscsi->vdev,
VIRTIO_SCSI_T_EVENTS_MISSED);
virtscsi_rescan_hotunplug(vscsi);
ret = virtscsi_rescan_hotunplug(vscsi);
if (ret)
return;
scsi_scan_host(virtio_scsi_host(vscsi->vdev));
}