linux-hardening - [PATCH] fs/affs: struct affs_head: Replace 1-element array with flexible array

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Message-Id: <20240710225709.work.175-kees@kernel.org>
Date: Wed, 10 Jul 2024 15:57:09 -0700
From: Kees Cook <kees@...nel.org>
To: David Sterba <dsterba@...e.com>
Cc: Kees Cook <kees@...nel.org>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] fs/affs: struct affs_head: Replace 1-element array with flexible array

AFFS uses struct affs_head's "table" array as a flexible array. Switch
this to a proper flexible array[1]. There are no sizeof() uses; struct
affs_head is only ever uses via direct casts. No binary output
differences were found after this change.

Link: https://github.com/KSPP/linux/issues/79 [1]
Signed-off-by: Kees Cook <kees@...nel.org>
---
Cc: David Sterba <dsterba@...e.com>
Cc: linux-fsdevel@...r.kernel.org
---
 fs/affs/amigaffs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/affs/amigaffs.h b/fs/affs/amigaffs.h
index 5509fbc98bc0..09dc23a644df 100644
--- a/fs/affs/amigaffs.h
+++ b/fs/affs/amigaffs.h
@@ -80,7 +80,7 @@ struct affs_head {
 	__be32 spare1;
 	__be32 first_data;
 	__be32 checksum;
-	__be32 table[1];
+	__be32 table[];
 };
 
 struct affs_tail {
-- 
2.34.1