Messages in this thread Patch in this message | | | Date | Mon, 13 Nov 2023 16:15:11 +0300 | From | Nikita Kiryushin <> | Subject | [PATCH] ACPICA: debugger: check status of acpi_evaluate_object in acpi_db_walk_for_fields |
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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.
Fixes: 5fd033288a86 ("ACPICA: debugger: add command to dump all fields of particular subtype") Signed-off-by: Nikita Kiryushin <kiryushin@ancud.ru> --- drivers/acpi/acpica/dbnames.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/acpica/dbnames.c b/drivers/acpi/acpica/dbnames.c index b91155ea9c34..c9131259f717 100644 --- a/drivers/acpi/acpica/dbnames.c +++ b/drivers/acpi/acpica/dbnames.c @@ -550,8 +550,12 @@ acpi_db_walk_for_fields(acpi_handle obj_handle, ACPI_FREE(buffer.pointer); 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 */ -- 2.34.1
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