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ACPICA: debugger: check status of acpi_evaluate_object() in acpi_db_walk_for_fields()

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ACPICA commit 9061cd9aa131205657c811a52a9f8325a040c6c9

Errors in acpi_evaluate_object() can lead to incorrect state of buffer.

This can lead to access to data in previously ACPI_FREEd buffer and
secondary ACPI_FREE to the same buffer later.

Handle errors in acpi_evaluate_object the same way it is done earlier
with acpi_ns_handle_to_pathname.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Link: https://github.com/acpica/acpica/commit/9061cd9a
Fixes: 5fd033288a ("ACPICA: debugger: add command to dump all fields of particular subtype")
Signed-off-by: Nikita Kiryushin <kiryushin@ancud.ru>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Nikita Kiryushin 2024-03-22 21:07:53 +03:00 committed by Rafael J. Wysocki
parent 4cece76496
commit 40e2710860
1 changed files with 6 additions and 2 deletions
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8
drivers/acpi/acpica/dbnames.c
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@ -550,8 +550,12 @@ acpi_db_walk_for_fields(acpi_handle obj_handle,
ACPI_FREE(buffer.pointer); ACPI_FREE(buffer.pointer);
buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER; buffer.length = ACPI_ALLOCATE_LOCAL_BUFFER;
acpi_evaluate_object(obj_handle, NULL, NULL, &buffer); status = acpi_evaluate_object(obj_handle, NULL, NULL, &buffer);
if (ACPI_FAILURE(status)) {
acpi_os_printf("Could Not evaluate object %p\n",
obj_handle);
return (AE_OK);
}
/* /*
* Since this is a field unit, surround the output in braces * Since this is a field unit, surround the output in braces
*/ */