linux-hardening - Re: [PATCH][next] crypto: qat - Avoid -Wflex-array-member-not-at-end warnings

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Message-ID: <Zg+tKna1el6xr6Dq@gondor.apana.org.au>
Date: Fri, 5 Apr 2024 15:50:02 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: giovanni.cabiddu@...el.com, davem@...emloft.net, qat-linux@...el.com,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
	gustavoars@...nel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] crypto: qat - Avoid -Wflex-array-member-not-at-end
 warnings

Gustavo A. R. Silva <gustavoars@...nel.org> wrote:
> -Wflex-array-member-not-at-end is coming in GCC-14, and we are getting
> ready to enable it globally.
> 
> Use the `__struct_group()` helper to separate the flexible array
> from the rest of the members in flexible `struct qat_alg_buf_list`,
> through tagged `struct qat_alg_buf_list_hdr`, and avoid embedding the
> flexible-array member in the middle of `struct qat_alg_fixed_buf_list`.
> 
> Also, use `container_of()` whenever we need to retrieve a pointer to
> the flexible structure.
> 
> So, with these changes, fix the following warnings:
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> 
> Link: https://github.com/KSPP/linux/issues/202
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
> drivers/crypto/intel/qat/qat_common/qat_bl.c |  6 ++++--
> drivers/crypto/intel/qat/qat_common/qat_bl.h | 11 +++++++----
> 2 files changed, 11 insertions(+), 6 deletions(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt