On 16/10/2018 19:52, Peter Maydell wrote:
> Taking the address of a field in a packed struct is a bad idea, because
> it might not be actually aligned enough for that pointer type (and
> thus cause a crash on dereference on some host architectures). Newer
> versions of clang warn about this. Avoid the bug by not using the
> "modify in place" byte swapping functions.
>
> Patch produced with scripts/coccinelle/inplace-byteswaps.cocci.
>
> Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <phi...@redhat.com>
> ---
> Automatically generated patch, tested with "make check" only.
>
> hw/acpi/nvdimm.c | 16 ++++++++--------
> 1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
> index 27eeb6609f5..e53b2cb6819 100644
> --- a/hw/acpi/nvdimm.c
> +++ b/hw/acpi/nvdimm.c
> @@ -581,7 +581,7 @@ static void nvdimm_dsm_func_read_fit(AcpiNVDIMMState
> *state, NvdimmDsmIn *in,
> int size;
>
> read_fit = (NvdimmFuncReadFITIn *)in->arg3;
> - le32_to_cpus(&read_fit->offset);
> + read_fit->offset = le32_to_cpu(read_fit->offset);
>
> fit = fit_buf->fit;
>
> @@ -742,8 +742,8 @@ static void nvdimm_dsm_get_label_data(NVDIMMDevice
> *nvdimm, NvdimmDsmIn *in,
> int size;
>
> get_label_data = (NvdimmFuncGetLabelDataIn *)in->arg3;
> - le32_to_cpus(&get_label_data->offset);
> - le32_to_cpus(&get_label_data->length);
> + get_label_data->offset = le32_to_cpu(get_label_data->offset);
> + get_label_data->length = le32_to_cpu(get_label_data->length);
>
> nvdimm_debug("Read Label Data: offset %#x length %#x.\n",
> get_label_data->offset, get_label_data->length);
> @@ -781,8 +781,8 @@ static void nvdimm_dsm_set_label_data(NVDIMMDevice
> *nvdimm, NvdimmDsmIn *in,
>
> set_label_data = (NvdimmFuncSetLabelDataIn *)in->arg3;
>
> - le32_to_cpus(&set_label_data->offset);
> - le32_to_cpus(&set_label_data->length);
> + set_label_data->offset = le32_to_cpu(set_label_data->offset);
> + set_label_data->length = le32_to_cpu(set_label_data->length);
>
> nvdimm_debug("Write Label Data: offset %#x length %#x.\n",
> set_label_data->offset, set_label_data->length);
> @@ -877,9 +877,9 @@ nvdimm_dsm_write(void *opaque, hwaddr addr, uint64_t val,
> unsigned size)
> in = g_new(NvdimmDsmIn, 1);
> cpu_physical_memory_read(dsm_mem_addr, in, sizeof(*in));
>
> - le32_to_cpus(&in->revision);
> - le32_to_cpus(&in->function);
> - le32_to_cpus(&in->handle);
> + in->revision = le32_to_cpu(in->revision);
> + in->function = le32_to_cpu(in->function);
> + in->handle = le32_to_cpu(in->handle);
>
> nvdimm_debug("Revision %#x Handler %#x Function %#x.\n", in->revision,
> in->handle, in->function);
>
