Commit 48e4c385 authored by Peter Oberparleiter's avatar Peter Oberparleiter Committed by Martin Schwidefsky
Browse files

[S390] cio: fix double free in case of probe failure



io_subchannel_probe() frees memory for sch->private which is later
freed again when io_subchannel_remove() is called. Fix this problem
by removing the cleanup in io_subchannel_probe().
Signed-off-by: default avatarPeter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent cf87b743
......@@ -1292,7 +1292,7 @@ static int io_subchannel_probe(struct subchannel *sch)
sch->private = kzalloc(sizeof(struct io_subchannel_private),
GFP_KERNEL | GFP_DMA);
if (!sch->private)
goto out_err;
goto out_schedule;
/*
* First check if a fitting device may be found amongst the
* disconnected devices or in the orphanage.
......@@ -1317,7 +1317,7 @@ static int io_subchannel_probe(struct subchannel *sch)
}
cdev = io_subchannel_create_ccwdev(sch);
if (IS_ERR(cdev))
goto out_err;
goto out_schedule;
rc = io_subchannel_recog(cdev, sch);
if (rc) {
spin_lock_irqsave(sch->lock, flags);
......@@ -1325,9 +1325,7 @@ static int io_subchannel_probe(struct subchannel *sch)
spin_unlock_irqrestore(sch->lock, flags);
}
return 0;
out_err:
kfree(sch->private);
sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
out_schedule:
io_subchannel_schedule_removal(sch);
return 0;
......@@ -1341,13 +1339,14 @@ io_subchannel_remove (struct subchannel *sch)
cdev = sch_get_cdev(sch);
if (!cdev)
return 0;
goto out_free;
/* Set ccw device to not operational and drop reference. */
spin_lock_irqsave(cdev->ccwlock, flags);
sch_set_cdev(sch, NULL);
cdev->private->state = DEV_STATE_NOT_OPER;
spin_unlock_irqrestore(cdev->ccwlock, flags);
ccw_device_unregister(cdev);
out_free:
kfree(sch->private);
sysfs_remove_group(&sch->dev.kobj, &io_subchannel_attr_group);
return 0;
......
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