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ACPICA: Fixes for parameter validation. 

Extra checks for valid handle/path combinations, BZ 478

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bob Moore 2007-02-02 19:48:22 +03:00 committed by Len Brown
parent c1014629c0
commit f1c2b1daf0
1 changed files with 26 additions and 23 deletions
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49
drivers/acpi/namespace/nsxfname.c
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@ -84,38 +84,41 @@ acpi_get_handle(acpi_handle parent,
/* Convert a parent handle to a prefix node */
if (parent) {
status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
prefix_node = acpi_ns_map_handle_to_node(parent);
if (!prefix_node) {
(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
return (AE_BAD_PARAMETER);
}
status = acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
if (ACPI_FAILURE(status)) {
return (status);
}
}
/* Special case for root, since we can't search for it */
if (ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH) == 0) {
*ret_handle =
acpi_ns_convert_entry_to_handle(acpi_gbl_root_node);
return (AE_OK);
}
/*
* Find the Node and convert to a handle
* Valid cases are:
* 1) Fully qualified pathname
* 2) Parent + Relative pathname
*
* Error for <null Parent + relative path>
*/
status = acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH,
&node);
if (acpi_ns_valid_root_prefix(pathname[0])) {
*ret_handle = NULL;
/* Pathname is fully qualified (starts with '\') */
/* Special case for root-only, since we can't search for it */
if (!ACPI_STRCMP(pathname, ACPI_NS_ROOT_PATH)) {
*ret_handle =
acpi_ns_convert_entry_to_handle(acpi_gbl_root_node);
return (AE_OK);
}
} else if (!prefix_node) {
/* Relative path with null prefix is disallowed */
return (AE_BAD_PARAMETER);
}
/* Find the Node and convert to a handle */
status =
acpi_ns_get_node(prefix_node, pathname, ACPI_NS_NO_UPSEARCH, &node);
if (ACPI_SUCCESS(status)) {
*ret_handle = acpi_ns_convert_entry_to_handle(node);
}