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scsi: core: Fix failure handling of scsi_add_host_with_dma()

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When scsi_add_host_with_dma() returns failure, the caller will call
scsi_host_put(shost) to release everything allocated for this host
instance. Consequently we can't also free allocated stuff in
scsi_add_host_with_dma(), otherwise we will end up with a double free.

Strictly speaking, host resource allocations should have been done in
scsi_host_alloc(). However, the allocations may need information which is
not yet provided by the driver when that function is called. So leave the
allocations where they are but rely on host device's release handler to
free resources.

Link: https://lore.kernel.org/r/20210602133029.2864069-3-ming.lei@redhat.com
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Hannes Reinecke <hare@suse.de>
Tested-by: John Garry <john.garry@huawei.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: John Garry <john.garry@huawei.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ming Lei 2021-06-02 21:30:27 +08:00 committed by Martin K. Petersen
parent 66a834d092
commit 3719f4ff04
1 changed files with 6 additions and 8 deletions
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14
drivers/scsi/hosts.c
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@ -278,23 +278,22 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
if (!shost->work_q) {
error = -EINVAL;
goto out_free_shost_data;
goto out_del_dev;
}
}
error = scsi_sysfs_add_host(shost);
if (error)
goto out_destroy_host;
goto out_del_dev;
scsi_proc_host_add(shost);
scsi_autopm_put_host(shost);
return error;
out_destroy_host:
if (shost->work_q)
destroy_workqueue(shost->work_q);
out_free_shost_data:
kfree(shost->shost_data);
/*
* Any host allocation in this function will be freed in
* scsi_host_dev_release().
*/
out_del_dev:
device_del(&shost->shost_dev);
out_del_gendev:
@ -304,7 +303,6 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
pm_runtime_disable(&shost->shost_gendev);
pm_runtime_set_suspended(&shost->shost_gendev);
pm_runtime_put_noidle(&shost->shost_gendev);
scsi_mq_destroy_tags(shost);
fail:
return error;
}