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A bug in scsi_alloc_target of drivers/scsi/scsi_scan.c

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  A bug in scsi_alloc_target of drivers/scsi/scsi_scan.c Dashi DS1 Cao <caods1@lenovo.com> - 2017-05-09 11:20 +0200

#1638001 — A bug in scsi_alloc_target of drivers/scsi/scsi_scan.c

When debugging a race condition in scsi_remove_target of 3.12, I ran into this possible bug within scsi_alloc_target.
When an existing "struct scsi_target" is found and used, the starget just got through kzmalloc should be freed, rather than dong a "put_device(dev)".

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 81d4151..96795d4 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -483,7 +483,7 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,

        spin_unlock_irqrestore(shost->host_lock, flags);
        if (ref_got) {
-               put_device(dev);
+               kfree(starget);
                return found_target;
        }
        /*
--

Dashi Cao

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