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scsi: core: Fix error handling of scsi_host_alloc()

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After device is initialized via device_initialize(), or its name is set via
dev_set_name(), the device has to be freed via put_device().  Otherwise
device name will be leaked because it is allocated dynamically in
dev_set_name().

Fix the leak by replacing kfree() with put_device(). Since
scsi_host_dev_release() properly handles IDA and kthread removal, remove
special-casing these from the error handling as well.

Link: https://lore.kernel.org/r/20210602133029.2864069-2-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 21:30:26 +08:00 committed by Martin K. Petersen
parent e57f5cd99c
commit 66a834d092
1 changed files with 13 additions and 10 deletions
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23
drivers/scsi/hosts.c
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@ -388,8 +388,10 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
mutex_init(&shost->scan_mutex);
index = ida_simple_get(&host_index_ida, 0, 0, GFP_KERNEL);
if (index < 0)
goto fail_kfree;
if (index < 0) {
kfree(shost);
return NULL;
}
shost->host_no = index;
shost->dma_channel = 0xff;
@ -481,7 +483,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
shost_printk(KERN_WARNING, shost,
"error handler thread failed to spawn, error = %ld\n",
PTR_ERR(shost->ehandler));
goto fail_index_remove;
goto fail;
}
shost->tmf_work_q = alloc_workqueue("scsi_tmf_%d",
@ -490,17 +492,18 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
if (!shost->tmf_work_q) {
shost_printk(KERN_WARNING, shost,
"failed to create tmf workq\n");
goto fail_kthread;
goto fail;
}
scsi_proc_hostdir_add(shost->hostt);
return shost;
fail:
/*
* Host state is still SHOST_CREATED and that is enough to release
* ->shost_gendev. scsi_host_dev_release() will free
* dev_name(&shost->shost_dev).
*/
put_device(&shost->shost_gendev);
fail_kthread:
kthread_stop(shost->ehandler);
fail_index_remove:
ida_simple_remove(&host_index_ida, shost->host_no);
fail_kfree:
kfree(shost);
return NULL;
}
EXPORT_SYMBOL(scsi_host_alloc);