Commit 55b31efc authored by Cathy Avery's avatar Cathy Avery Committed by Greg Kroah-Hartman

xen-blkfront: check for null drvdata in blkback_changed (XenbusStateClosing)

commit a54c8f0f upstream.

xen-blkfront will crash if the check to talk_to_blkback()
in blkback_changed()(XenbusStateInitWait) returns an error.
The driver data is freed and info is set to NULL. Later during
the close process via talk_to_blkback's call to xenbus_dev_fatal()
the null pointer is passed to and dereference in blkfront_closing.
Signed-off-by: default avatarCathy Avery <cathy.avery@oracle.com>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9addc07f
......@@ -1984,7 +1984,8 @@ static void blkback_changed(struct xenbus_device *dev,
break;
/* Missed the backend's Closing state -- fallthrough */
case XenbusStateClosing:
blkfront_closing(info);
if (info)
blkfront_closing(info);
break;
}
}
......
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