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

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Date:   Sat, 3 Sep 2022 00:08:51 +0100
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Cc: linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org, ;
Subject: [PATCH][next] exportfs: 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 array
declaration in struct fid with the new DECLARE_FLEX_ARRAY()
helper macro.

This helper allows for a flexible-array member in a union.

Link: https://github.com/KSPP/linux/issues/21
Link: https://github.com/KSPP/linux/issues/193
Link: https://github.com/KSPP/linux/issues/197
Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 include/linux/exportfs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h
index fe848901fcc3..1640d97e4c0d 100644
--- a/include/linux/exportfs.h
+++ b/include/linux/exportfs.h
@@ -131,7 +131,7 @@ struct fid {
  			u32 parent_block;
  			u32 parent_generation;
  		} udf;
-		__u32 raw[0];
+		DECLARE_FLEX_ARRAY(__u32, raw);
 	};
 };
 
-- 
2.34.1