linux-hardening - [PATCH v2][next] iio: proximity: cros_ec_mkbp_proximity: Avoid -Wflex-array-member-not-at-end warning

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Message-ID: <Z9lEYdPPIyiRGm36@kspp>
Date: Tue, 18 Mar 2025 20:31:05 +1030
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Benson Leung <bleung@...omium.org>,
	Guenter Roeck <groeck@...omium.org>,
	Tzung-Bi Shih <tzungbi@...nel.org>
Cc: linux-iio@...r.kernel.org, chrome-platform@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org, Kees Cook <kees@...nel.org>
Subject: [PATCH v2][next] iio: proximity: cros_ec_mkbp_proximity: Avoid
 -Wflex-array-member-not-at-end warning

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
a flexible structure where the size of the flexible-array member
is known at compile-time, and refactor the rest of the code,
accordingly.

So, with these changes, fix the following warning:

drivers/iio/proximity/cros_ec_mkbp_proximity.c:63:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
Changes in v2:
 - Use MAX() to calculate the number of bytes for the flex array. (Kees)

v1:
 - Link: https://lore.kernel.org/linux-hardening/Z9dzDB1gttXehYGO@kspp/

 drivers/iio/proximity/cros_ec_mkbp_proximity.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/iio/proximity/cros_ec_mkbp_proximity.c b/drivers/iio/proximity/cros_ec_mkbp_proximity.c
index 667369be0555..d2ddb7d45ec2 100644
--- a/drivers/iio/proximity/cros_ec_mkbp_proximity.c
+++ b/drivers/iio/proximity/cros_ec_mkbp_proximity.c
@@ -59,16 +59,11 @@ static int cros_ec_mkbp_proximity_parse_state(const void *data)
 static int cros_ec_mkbp_proximity_query(struct cros_ec_device *ec_dev,
 					int *state)
 {
-	struct {
-		struct cros_ec_command msg;
-		union {
-			struct ec_params_mkbp_info params;
-			u32 switches;
-		};
-	} __packed buf = { };
-	struct ec_params_mkbp_info *params = &buf.params;
-	struct cros_ec_command *msg = &buf.msg;
-	u32 *switches = &buf.switches;
+	DEFINE_RAW_FLEX(struct cros_ec_command, buf, data,
+			MAX(sizeof(u32), sizeof(struct ec_params_mkbp_info)));
+	struct ec_params_mkbp_info *params = (struct ec_params_mkbp_info *)buf->data;
+	struct cros_ec_command *msg = buf;
+	u32 *switches = (u32 *)buf->data;
 	size_t insize = sizeof(*switches);
 	int ret;
 
-- 
2.43.0