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| author |   David E. Box <david.e.box@linux.intel.com> | 2014-07-08 10:06:24 +0800 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-07-08 14:22:25 +0200 |
| commit | e23d9b8297546c6ceb7e70771e4915f2a41733cd (patch) | |
| tree | 1abe5f05beea0d796157fdfe4036c47cc526be38 | |
| parent | ACPICA: Utilities: Validate full RSDP header (diff) | |
| download | linux-dev-e23d9b8297546c6ceb7e70771e4915f2a41733cd.tar.xz linux-dev-e23d9b8297546c6ceb7e70771e4915f2a41733cd.zip | |
ACPICA: Namespace: Properly null terminate objects detached from a namespace node
Fixes a bug exposed by an ACPICA unit test around the
acpi_attach_data()/acpi_detach_data() APIs where the failure to null
terminate a detached object led to the creation of a circular linked list
(and infinite looping) when the object is reattached.
Reported in acpica bugzilla #1063
Link: https://bugs.acpica.org/show_bug.cgi?id=1063
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Cc: 3.15+ <stable@vger.kernel.org> # 3.15+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | drivers/acpi/acpica/nsobject.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nsobject.c b/drivers/acpi/acpica/nsobject.c index fe54a8c73b8c..f1ea8e56cd87 100644 --- a/drivers/acpi/acpica/nsobject.c +++ b/drivers/acpi/acpica/nsobject.c @@ -239,6 +239,17 @@ void acpi_ns_detach_object(struct acpi_namespace_node *node) } } + /* + * Detach the object from any data objects (which are still held by + * the namespace node) + */ + + if (obj_desc->common.next_object && + ((obj_desc->common.next_object)->common.type == + ACPI_TYPE_LOCAL_DATA)) { + obj_desc->common.next_object = NULL; + } + /* Reset the node type to untyped */ node->type = ACPI_TYPE_ANY; |