From: Ming Lei ming.lei@redhat.com
commit 66a834d092930cf41d809c0e989b13cd6f9ca006 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/scsi/hosts.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-)
--- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -404,8 +404,10 @@ struct Scsi_Host *scsi_host_alloc(struct 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; @@ -493,7 +495,7 @@ struct Scsi_Host *scsi_host_alloc(struct 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", @@ -502,17 +504,18 @@ struct Scsi_Host *scsi_host_alloc(struct 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);