[patch 26/52] [PATCH] cio: fix double free in case of probe failure

Martin Schwidefsky
2009-11-13T15:15:44Z

[-- Attachment #1: 125-cio-probe-free.diff --]
[-- Type: text/plain, Size: 1969 bytes --]

From: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>

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: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

drivers/s390/cio/device.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)

Index: quilt-2.6/drivers/s390/cio/device.c
===================================================================
--- quilt-2.6.orig/drivers/s390/cio/device.c 2009-11-13 15:48:33.000000000 +0100
+++ quilt-2.6/drivers/s390/cio/device.c 2009-11-13 16:08:17.000000000 +0100
@@ -1292,7 +1292,7 @@
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 @@
}
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 @@
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 @@

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;