linux-hardening - [PATCH][next] i2c: acpi: Replace zero-length array with DECLARE_FLEX

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Message-ID: <YzId7dQGWxMyXHEU@work>
Date:   Mon, 26 Sep 2022 16:47:25 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Wolfram Sang <wsa@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     linux-i2c@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] i2c: acpi: Replace zero-length array with
 DECLARE_FLEX_ARRAY() helper

Zero-length arrays are deprecated and we are moving towards adopting
C99 flexible-array members, instead. So, replace zero-length arrays
declarations in anonymous union with the new DECLARE_FLEX_ARRAY()
helper macro.

This helper allows for flexible-array members in unions.

Link: https://github.com/KSPP/linux/issues/193
Link: https://github.com/KSPP/linux/issues/218
Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/i2c/i2c-core-acpi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index 08b561f0709d..da6568a20177 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -26,7 +26,7 @@ struct gsb_buffer {
 	union {
 		u16	wdata;
 		u8	bdata;
-		u8	data[0];
+		DECLARE_FLEX_ARRAY(u8, data);
 	};
 } __packed;
 
-- 
2.34.1