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| author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2009-09-11 10:28:23 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-09-11 10:29:39 +0200 |
| commit | f014824ee72e66292c3b1172dc142f959b42e61b (patch) | |
| tree | 34281651ecca3279d55df0db7fc28f942841319d | |
| parent | 3f09bb8965cefe36f42a9ec09ebb821523eba530 (diff) | |
| download | linux-f014824ee72e66292c3b1172dc142f959b42e61b.tar.gz | |
[S390] cio: fix use after free in s390 debug feature
When using s390dbf with "%s" in sprintf format strings the string itself is not copied to the dbf buffer. Since in this case only pointers are stored in the s390dbf, we should not use dev_name - which is bound to the lifetime of the device. Reading this entry from s390dbf after the device was released will cause an use after free error. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| -rw-r--r-- | drivers/s390/cio/device.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c index a50cfa51aa3c..6b770f8c0a89 100644 --- a/drivers/s390/cio/device.c +++ b/drivers/s390/cio/device.c @@ -2038,7 +2038,9 @@ static void __ccw_device_pm_restore(struct ccw_device *cdev) spin_unlock_irq(sch->lock); if (ret) { CIO_MSG_EVENT(0, "Couldn't start recognition for device " - "%s (ret=%d)\n", dev_name(&cdev->dev), ret); + "0.%x.%04x (ret=%d)\n", + cdev->private->dev_id.ssid, + cdev->private->dev_id.devno, ret); spin_lock_irq(sch->lock); cdev->private->state = DEV_STATE_DISCONNECTED; spin_unlock_irq(sch->lock); @@ -2101,8 +2103,9 @@ static int ccw_device_pm_restore(struct device *dev) } /* check if the device id has changed */ if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) { - CIO_MSG_EVENT(0, "resume: sch %s: failed (devno changed from " - "%04x to %04x)\n", dev_name(&sch->dev), + CIO_MSG_EVENT(0, "resume: sch 0.%x.%04x: failed (devno " + "changed from %04x to %04x)\n", + sch->schid.ssid, sch->schid.sch_no, cdev->private->dev_id.devno, sch->schib.pmcw.dev); goto out_unreg_unlock; @@ -2135,8 +2138,9 @@ static int ccw_device_pm_restore(struct device *dev) if (cm_enabled) { ret = ccw_set_cmf(cdev, 1); if (ret) { - CIO_MSG_EVENT(2, "resume: cdev %s: cmf failed " - "(rc=%d)\n", dev_name(&cdev->dev), ret); + CIO_MSG_EVENT(2, "resume: cdev 0.%x.%04x: cmf failed " + "(rc=%d)\n", cdev->private->dev_id.ssid, + cdev->private->dev_id.devno, ret); ret = 0; } } |