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ndctl, list: fix crash when listing idle device-dax instances
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BZ:
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commit 4a934b716888d116895e96b0a48a6f5a562cedd0
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Author: Dan Williams <dan.j.williams@intel.com>
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Date: Thu Sep 28 15:40:54 2017 -0700
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ndctl, list: fix crash when listing idle device-dax instances
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The following crash results from running 'ndctl list -i' on an inactive
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namespace that is claimed for device-dax operation.
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Program received signal SIGSEGV, Segmentation fault.
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daxctl_dev_get_devname (dev=0x0) at libdaxctl.c:566
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566 return devpath_to_devname(dev->dev_path);
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(gdb) bt
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#0 daxctl_dev_get_devname (dev=0x0) at libdaxctl.c:566
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#1 0x0000555555563b39 in util_namespace_to_json
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at ../util/json.c:751
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By definition the 'chardev' attribute for a device-dax instance can not
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be found if the device-dax instance is disabled, because enabling the
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namespace creates the child character device(s).
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Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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diff --git a/util/json.c b/util/json.c
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index dac8692..d1ee351 100644
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--- a/util/json.c
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+++ b/util/json.c
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@@ -747,12 +747,18 @@ struct json_object *util_namespace_to_json(struct ndctl_namespace *ndns,
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} else if (dax_region) {
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struct daxctl_dev *dev;
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+ /*
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+ * We can only find/list these device-dax
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+ * details when the instance is enabled.
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+ */
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dev = daxctl_dev_get_first(dax_region);
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- name = daxctl_dev_get_devname(dev);
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- jobj = json_object_new_string(name);
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- if (!jobj)
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- goto err;
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- json_object_object_add(jndns, "chardev", jobj);
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+ if (dev) {
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+ name = daxctl_dev_get_devname(dev);
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+ jobj = json_object_new_string(name);
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+ if (!jobj)
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+ goto err;
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+ json_object_object_add(jndns, "chardev", jobj);
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+ }
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}
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} else if (ndctl_namespace_get_type(ndns) != ND_DEVICE_NAMESPACE_IO) {
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ndctl_namespace_get_uuid(ndns, uuid);
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