[PATCH][next] RDMA/erdma: Replace zero-length arrays with flexible-array members

[PATCH][next] RDMA/erdma: Replace zero-length arrays with flexible-array members

[Gustavo A. R. Silva]

Zero-length arrays are deprecated[1] and we are moving towards
adopting C99 flexible-array members instead. So, replace zero-length
arrays, in a couple of structures, with flex-array members.

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [2].

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays [1]
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
Link: https://github.com/KSPP/linux/issues/78
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/infiniband/hw/erdma/erdma_hw.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/erdma/erdma_hw.h b/drivers/infiniband/hw/erdma/erdma_hw.h
index ab371fec610c..4c38d99c73f1 100644
--- a/drivers/infiniband/hw/erdma/erdma_hw.h
+++ b/drivers/infiniband/hw/erdma/erdma_hw.h
@@ -397,7 +397,7 @@ struct erdma_write_sqe {
 
 	__le32 rsvd;
 
-	struct erdma_sge sgl[0];
+	struct erdma_sge sgl[];
 };
 
 struct erdma_send_sqe {
@@ -408,7 +408,7 @@ struct erdma_send_sqe {
 	};
 
 	__le32 length;
-	struct erdma_sge sgl[0];
+	struct erdma_sge sgl[];
 };
 
 struct erdma_readreq_sqe {
-- 
2.34.1

Re: [PATCH][next] RDMA/erdma: Replace zero-length arrays with flexible-array members

[Cheng Xu]

On 1/10/23 9:40 AM, Gustavo A. R. Silva wrote:
> Zero-length arrays are deprecated[1] and we are moving towards
> adopting C99 flexible-array members instead. So, replace zero-length
> arrays, in a couple of structures, with flex-array members.
> 
> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> routines on memcpy() and help us make progress towards globally
> enabling -fstrict-flex-arrays=3 [2].
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays [1]
> Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
> Link: https://github.com/KSPP/linux/issues/78
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
>  drivers/infiniband/hw/erdma/erdma_hw.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 

Acked-by: Cheng Xu <chengyou@linux.alibaba.com>

Thanks very much,
Cheng Xu


> diff --git a/drivers/infiniband/hw/erdma/erdma_hw.h b/drivers/infiniband/hw/erdma/erdma_hw.h
> index ab371fec610c..4c38d99c73f1 100644
> --- a/drivers/infiniband/hw/erdma/erdma_hw.h
> +++ b/drivers/infiniband/hw/erdma/erdma_hw.h
> @@ -397,7 +397,7 @@ struct erdma_write_sqe {
>  
>  	__le32 rsvd;
>  
> -	struct erdma_sge sgl[0];
> +	struct erdma_sge sgl[];
>  };
>  
>  struct erdma_send_sqe {
> @@ -408,7 +408,7 @@ struct erdma_send_sqe {
>  	};
>  
>  	__le32 length;
> -	struct erdma_sge sgl[0];
> +	struct erdma_sge sgl[];
>  };
>  
>  struct erdma_readreq_sqe {

Re: [PATCH][next] RDMA/erdma: Replace zero-length arrays with flexible-array members

[Kees Cook]

On Mon, Jan 09, 2023 at 07:40:22PM -0600, Gustavo A. R. Silva wrote:
> Zero-length arrays are deprecated[1] and we are moving towards
> adopting C99 flexible-array members instead. So, replace zero-length
> arrays, in a couple of structures, with flex-array members.
> 
> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> routines on memcpy() and help us make progress towards globally
> enabling -fstrict-flex-arrays=3 [2].
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays [1]
> Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
> Link: https://github.com/KSPP/linux/issues/78
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Reviewed-by: Kees Cook <keescook@chromium.org>

-- 
Kees Cook

Re: [PATCH][next] RDMA/erdma: Replace zero-length arrays with flexible-array members

[Leon Romanovsky]

On Mon, 09 Jan 2023 19:40:22 -0600, Gustavo A. R. Silva wrote:
> Zero-length arrays are deprecated[1] and we are moving towards
> adopting C99 flexible-array members instead. So, replace zero-length
> arrays, in a couple of structures, with flex-array members.
> 
> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> routines on memcpy() and help us make progress towards globally
> enabling -fstrict-flex-arrays=3 [2].
> 
> [...]

Applied, thanks!

[1/1] RDMA/erdma: Replace zero-length arrays with flexible-array members
      https://git.kernel.org/rdma/rdma/c/ed73a505480d54

Best regards,
-- 
Leon Romanovsky <leon@kernel.org>