linux-hardening - [PATCH v4] [next] dlm: replace one-element array with fixed size array

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Date:   Wed, 12 Oct 2022 09:04:15 +1300
From:   Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>
To:     Christine Caulfield <ccaulfie@...hat.com>,
        David Teigland <teigland@...hat.com>, cluster-devel@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        paulo.miguel.almeida.rodenas@...il.com
Subject: [PATCH v4] [next] dlm: replace one-element array with fixed size
 array

One-element arrays are deprecated. So, replace one-element array with
fixed size array member in struct dlm_ls, and refactor the rest of the
code, accordingly.

Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/228
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101836
Link: https://lore.kernel.org/lkml/Y0W5jkiXUkpNl4ap@mail.google.com/

Signed-off-by: Paulo Miguel Almeida <paulo.miguel.almeida.rodenas@...il.com>
---
Changelog:

v4: resend patch using the right version number. Req: Gustavo Silva
v3: replace one-element array with a fixed size array. Req: Kees Cook
v2: patch resent as I had an issue with a <CRLF> char in my mail client
v1: https://lore.kernel.org/lkml/Y0ICbf8tCtXMn+W0@mail.google.com/
---
 fs/dlm/dlm_internal.h | 2 +-
 fs/dlm/lockspace.c    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index e34c3d2639a5..94fadb619ba0 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -670,7 +670,7 @@ struct dlm_ls {
 	void			*ls_ops_arg;
 
 	int			ls_namelen;
-	char			ls_name[1];
+	char			ls_name[DLM_LOCKSPACE_LEN + 1];
 };
 
 /*
diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c
index bae050df7abf..23de0d47cbc1 100644
--- a/fs/dlm/lockspace.c
+++ b/fs/dlm/lockspace.c
@@ -473,7 +473,7 @@ static int new_lockspace(const char *name, const char *cluster,
 
 	error = -ENOMEM;
 
-	ls = kzalloc(sizeof(struct dlm_ls) + namelen, GFP_NOFS);
+	ls = kzalloc(sizeof(struct dlm_ls), GFP_NOFS);
 	if (!ls)
 		goto out;
 	memcpy(ls->ls_name, name, namelen);
-- 
2.37.3