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Date:   Fri, 14 May 2021 16:52:09 -0500
From:   "Gustavo A. R. Silva" <>
To:     Ilya Dryomov <>,
        Jeff Layton <>,
        "David S. Miller" <>,
        Jakub Kicinski <>
        "Gustavo A. R. Silva" <>,
Subject: [PATCH][next] ceph: Replace zero-length array with flexible array

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].

Notice that, in this case, sizeof(au->reply_buf) translates to zero,
becase in the original code reply_buf is a zero-length array. Now that
reply_buf is transformed into a flexible array, the mentioned line of
code is now replaced by a literal 0.

Also, as a safeguard, explicitly assign NULL to
auth->authorizer_reply_buf, as no heap is allocated for it, therefore
it should not be accessible.


Signed-off-by: Gustavo A. R. Silva <>
 net/ceph/auth_none.c | 4 ++--
 net/ceph/auth_none.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/ceph/auth_none.c b/net/ceph/auth_none.c
index 70e86e462250..10ee16d2cbf0 100644
--- a/net/ceph/auth_none.c
+++ b/net/ceph/auth_none.c
@@ -111,8 +111,8 @@ static int ceph_auth_none_create_authorizer(
 	auth->authorizer = (struct ceph_authorizer *) au;
 	auth->authorizer_buf = au->buf;
 	auth->authorizer_buf_len = au->buf_len;
-	auth->authorizer_reply_buf = au->reply_buf;
-	auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
+	auth->authorizer_reply_buf_len = 0;
+	auth->authorizer_reply_buf = NULL;
 	return 0;
diff --git a/net/ceph/auth_none.h b/net/ceph/auth_none.h
index 4158f064302e..3c68c0ee3dab 100644
--- a/net/ceph/auth_none.h
+++ b/net/ceph/auth_none.h
@@ -16,7 +16,7 @@ struct ceph_none_authorizer {
 	struct ceph_authorizer base;
 	char buf[128];
 	int buf_len;
-	char reply_buf[0];
+	char reply_buf[];
 struct ceph_auth_none_info {

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