From: Kees Cook <kees@xxxxxxxxxxx> ACPICA commit f4a3afd78c28dede0907f47951f0b73c9a776d4e The "Source" array is actually a dynamically sized array, but it is defined as a fixed-size 4 byte array. This results in tripping both compile-time and run-time bounds checkers (e.g. via either __builtin_object_size() or -fsanitize=bounds). To retain the padding, create a union with an unused Pad variable of size 4, and redefine Source as a proper flexible array member. No binary changes appear in the .text nor .data sections. Link: https://github.com/acpica/acpica/commit/f4a3afd7 Signed-off-by: Bob Moore <robert.moore@xxxxxxxxx> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> --- include/acpi/acrestyp.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/include/acpi/acrestyp.h b/include/acpi/acrestyp.h index 52e82d65016b..4c3b7b393f82 100644 --- a/include/acpi/acrestyp.h +++ b/include/acpi/acrestyp.h @@ -693,7 +693,10 @@ struct acpi_pci_routing_table { u32 pin; u64 address; /* here for 64-bit alignment */ u32 source_index; - char source[4]; /* pad to 64 bits so sizeof() works in all cases */ + union { + char pad[4]; /* pad to 64 bits so sizeof() works in all cases */ + ACPI_FLEX_ARRAY(char, source); + }; }; #endif /* __ACRESTYP_H__ */ -- 2.35.3
