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

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Date: Mon, 25 Mar 2024 14:44:55 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>
Cc: qat-linux@...el.com, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH][next] crypto: qat - Avoid -Wflex-array-member-not-at-end
 warnings

-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(-)

diff --git a/drivers/crypto/intel/qat/qat_common/qat_bl.c b/drivers/crypto/intel/qat/qat_common/qat_bl.c
index 76baed0a76c0..338acf29c487 100644
--- a/drivers/crypto/intel/qat/qat_common/qat_bl.c
+++ b/drivers/crypto/intel/qat/qat_common/qat_bl.c
@@ -81,7 +81,8 @@ static int __qat_bl_sgl_to_bufl(struct adf_accel_dev *accel_dev,
 		if (unlikely(!bufl))
 			return -ENOMEM;
 	} else {
-		bufl = &buf->sgl_src.sgl_hdr;
+		bufl = container_of(&buf->sgl_src.sgl_hdr,
+				    struct qat_alg_buf_list, hdr);
 		memset(bufl, 0, sizeof(struct qat_alg_buf_list));
 		buf->sgl_src_valid = true;
 	}
@@ -139,7 +140,8 @@ static int __qat_bl_sgl_to_bufl(struct adf_accel_dev *accel_dev,
 			if (unlikely(!buflout))
 				goto err_in;
 		} else {
-			buflout = &buf->sgl_dst.sgl_hdr;
+			buflout = container_of(&buf->sgl_dst.sgl_hdr,
+					       struct qat_alg_buf_list, hdr);
 			memset(buflout, 0, sizeof(struct qat_alg_buf_list));
 			buf->sgl_dst_valid = true;
 		}
diff --git a/drivers/crypto/intel/qat/qat_common/qat_bl.h b/drivers/crypto/intel/qat/qat_common/qat_bl.h
index d87e4f35ac39..85bc32a9ec0e 100644
--- a/drivers/crypto/intel/qat/qat_common/qat_bl.h
+++ b/drivers/crypto/intel/qat/qat_common/qat_bl.h
@@ -15,14 +15,17 @@ struct qat_alg_buf {
 } __packed;
 
 struct qat_alg_buf_list {
-	u64 resrvd;
-	u32 num_bufs;
-	u32 num_mapped_bufs;
+	/* New members must be added within the __struct_group() macro below. */
+	__struct_group(qat_alg_buf_list_hdr, hdr, __packed,
+		u64 resrvd;
+		u32 num_bufs;
+		u32 num_mapped_bufs;
+	);
 	struct qat_alg_buf buffers[];
 } __packed;
 
 struct qat_alg_fixed_buf_list {
-	struct qat_alg_buf_list sgl_hdr;
+	struct qat_alg_buf_list_hdr sgl_hdr;
 	struct qat_alg_buf descriptors[QAT_MAX_BUFF_DESC];
 } __packed __aligned(64);
 
-- 
2.34.1