linux-kernel - [PATCH] erofs: Replace zero-length array with flexible-array member

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Date:   Mon,  6 Dec 2021 20:17:02 +0800
From:   Gao Xiang <hsiangkao@...ux.alibaba.com>
To:     linux-erofs@...ts.ozlabs.org, Chao Yu <chao@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Gao Xiang <hsiangkao@...ux.alibaba.com>,
        Abaci Robot <abaci@...ux.alibaba.com>
Subject: [PATCH] erofs: Replace zero-length array with flexible-array member

There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.

Kernel code should always use `flexible array members' [1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used [2].

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.15/process/deprecated.html#zero-length-and-one-element-arrays

Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
---
 fs/erofs/erofs_fs.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/erofs/erofs_fs.h b/fs/erofs/erofs_fs.h
index f4506a642a12..dda79afb901d 100644
--- a/fs/erofs/erofs_fs.h
+++ b/fs/erofs/erofs_fs.h
@@ -209,7 +209,7 @@ struct erofs_xattr_ibody_header {
 	__le32 h_reserved;
 	__u8   h_shared_count;
 	__u8   h_reserved2[7];
-	__le32 h_shared_xattrs[0];      /* shared xattr id array */
+	__le32 h_shared_xattrs[];       /* shared xattr id array */
 };
 
 /* Name indexes */
@@ -226,7 +226,7 @@ struct erofs_xattr_entry {
 	__u8   e_name_index;    /* attribute name index */
 	__le16 e_value_size;    /* size of attribute value */
 	/* followed by e_name and e_value */
-	char   e_name[0];       /* attribute name */
+	char   e_name[];        /* attribute name */
 };
 
 static inline unsigned int erofs_xattr_ibody_size(__le16 i_xattr_icount)
-- 
2.24.4