Hi all,
Friendly ping:
We are about to be able to globally enable -Warray-bounds and, this is one of the
last out-of-bounds warnings in linux-next.
Could someone take this, please?
Thanks
--
Gustavo
On 2/10/21 16:57, Gustavo A. R. Silva wrote:
> There is a regular need in the kernel to provide a way to declare having
> a dynamically sized set of trailing elements in a structure. Kernel code
> should always use “flexible array members”[1] for these cases. The older
> style of one-element or zero-length arrays should no longer be used[2].
>
> Use flexible-array member in struct hfi_sys_set_property_pkt instead of
> one-element array.
>
> Also, this helps with the ongoing efforts to enable -Warray-bounds and
> fix the following warnings:
>
> drivers/media/platform/qcom/venus/hfi_cmds.c: In function ‘pkt_sys_coverage_config’:
> drivers/media/platform/qcom/venus/hfi_cmds.c:57:11: warning: array subscript 1 is above array bounds of ‘u32[1]’ {aka ‘unsigned int[1]’} [-Warray-bounds]
> 57 | pkt->data[1] = mode;
> | ~~~~~~~~~^~~
>
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/v5.9/process/deprecated.html#zero-length-and-one-element-arrays
>
> Link: https://github.com/KSPP/linux/issues/79
> Link: https://github.com/KSPP/linux/issues/109
> Build-tested-by: kernel test robot <lkp@xxxxxxxxx>
> Link: https://lore.kernel.org/lkml/602416da.iZqae7Dbk7nyl6OY%25lkp@xxxxxxxxx/
> Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
> ---
> drivers/media/platform/qcom/venus/hfi_cmds.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/qcom/venus/hfi_cmds.h b/drivers/media/platform/qcom/venus/hfi_cmds.h
> index 83705e237f1c..327ed90a2788 100644
> --- a/drivers/media/platform/qcom/venus/hfi_cmds.h
> +++ b/drivers/media/platform/qcom/venus/hfi_cmds.h
> @@ -68,7 +68,7 @@ struct hfi_sys_release_resource_pkt {
> struct hfi_sys_set_property_pkt {
> struct hfi_pkt_hdr hdr;
> u32 num_properties;
> - u32 data[1];
> + u32 data[];
> };
>
> struct hfi_sys_get_property_pkt {
>
