scsi: snic: Fix double free in snic_tgt_create()

Commit 41320b18a0e0 ("scsi: snic: Fix possible memory leak if device_add()
fails") fixed the memory leak caused by dev_set_name() when device_add()
failed. However, it did not consider that 'tgt' has already been released
when put_device(&tgt->dev) is called. Remove kfree(tgt) in the error path
to avoid double free of 'tgt' and move put_device(&tgt->dev) after the
removed kfree(tgt) to avoid a use-after-free.

Fixes: 41320b18a0e0 ("scsi: snic: Fix possible memory leak if device_add() fails")
Signed-off-by: Zhu Wang <wangzhu9@huawei.com>
Link: https://lore.kernel.org/r/20230819083941.164365-1-wangzhu9@huawei.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/snic/snic_disc.c b/drivers/scsi/snic/snic_disc.c
index e429ad23c396dab72d68434d57936dc1b7b6fbb4..4db3ba62fcd36471b04abf585bdf3135d002af76 100644 (file)
--- a/drivers/scsi/snic/snic_disc.c
+++ b/drivers/scsi/snic/snic_disc.c
@@ -303,12 +303,11 @@ snic_tgt_create(struct snic *snic, struct snic_tgt_id *tgtid)
                              "Snic Tgt: device_add, with err = %d\n",
                              ret);
 
-               put_device(&tgt->dev);
                put_device(&snic->shost->shost_gendev);
                spin_lock_irqsave(snic->shost->host_lock, flags);
                list_del(&tgt->list);
                spin_unlock_irqrestore(snic->shost->host_lock, flags);
-               kfree(tgt);
+               put_device(&tgt->dev);
                tgt = NULL;
 
                return tgt;