[S390] monreader: fix use after free bug with suspend/resume

The monreader device driver doesn't set dev->driver_data to NULL after
freeing the corresponding data structure. This leads to a use after
free bug in the freeze/thaw suspend/resume functions after the device
has been opened and closed once. Fix this by clearing dev->driver_data
in the close() function.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/char/monreader.c b/drivers/s390/char/monreader.c
index 89ece1c..66e21dd 100644 (file)
--- a/drivers/s390/char/monreader.c
+++ b/drivers/s390/char/monreader.c
@@ -357,6 +357,7 @@ static int mon_close(struct inode *inode, struct file *filp)
        atomic_set(&monpriv->msglim_count, 0);
        monpriv->write_index  = 0;
        monpriv->read_index   = 0;
+       dev_set_drvdata(monreader_device, NULL);
 
        for (i = 0; i < MON_MSGLIM; i++)
                kfree(monpriv->msg_array[i]);