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Compiler packing attribute is not recursive for inner declarations. Mismatched alignment information can cause undefined behavior in code generated for accessing composite type members. struct pointers passed to thunderstrike_parse_board_info_payload and thunderstrike_parse_haptics_payload are an example of this being potentially problematic since alignment information from the packed HOSTCMD report is lost. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202307041500.6bKn7nCl-lkp@intel.com/ Link: https://github.com/llvm/llvm-project/issues/55520#issuecomment-1128617570 Link: https://gcc.gnu.org/onlinedocs/gcc-13.1.0/gcc/Common-Type-Attributes.html#index-packed-type-attribute Signed-off-by: Rahul Rameshbabu --- drivers/hid/hid-nvidia-shield.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/hid/hid-nvidia-shield.c b/drivers/hid/hid-nvidia-shield.c index 85700cec5eac..a928ad2be62d 100644 --- a/drivers/hid/hid-nvidia-shield.c +++ b/drivers/hid/hid-nvidia-shield.c @@ -63,12 +63,12 @@ static_assert(sizeof(enum thunderstrike_led_state) == 1); struct thunderstrike_hostcmd_board_info { __le16 revision; __le16 serial[7]; -}; +} __packed; struct thunderstrike_hostcmd_haptics { u8 motor_left; u8 motor_right; -}; +} __packed; struct thunderstrike_hostcmd_resp_report { u8 report_id; /* THUNDERSTRIKE_HOSTCMD_RESP_REPORT_ID */ @@ -81,7 +81,7 @@ struct thunderstrike_hostcmd_resp_report { __le16 fw_version; enum thunderstrike_led_state led_state; u8 payload[30]; - }; + } __packed; } __packed; static_assert(sizeof(struct thunderstrike_hostcmd_resp_report) == THUNDERSTRIKE_HOSTCMD_REPORT_SIZE); @@ -92,15 +92,15 @@ struct thunderstrike_hostcmd_req_report { u8 reserved_at_10; union { - struct { + struct __packed { u8 update; enum thunderstrike_led_state state; } led; - struct { + struct __packed { u8 update; struct thunderstrike_hostcmd_haptics motors; } haptics; - }; + } __packed; u8 reserved_at_30[27]; } __packed; static_assert(sizeof(struct thunderstrike_hostcmd_req_report) ==