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authorSebastian Ott <sebott@linux.vnet.ibm.com>2009-09-11 10:28:23 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-09-11 10:29:39 +0200
commitf014824ee72e66292c3b1172dc142f959b42e61b (patch)
tree34281651ecca3279d55df0db7fc28f942841319d /drivers/s390
parent3f09bb8965cefe36f42a9ec09ebb821523eba530 (diff)
[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>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/device.c14
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;
}
}