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Date:   Fri, 23 Sep 2022 20:52:26 -0700
From:   Kees Cook <>
To:     Christine Caulfield <>
Cc:     Kees Cook <>,
        David Teigland <>,,
        "Gustavo A. R. Silva" <>,,
Subject: [PATCH] dlm: Split memcpy() of struct dlm_message flexible array

To work around a misbehavior of the compiler's ability to see into
composite flexible array structs (as detailed in the coming memcpy()
hardening series[1]), split the memcpy() of the header and the payload
so no false positive run-time overflow warning will be generated.


Cc: Christine Caulfield <>
Cc: David Teigland <>
Reported-by: "Gustavo A. R. Silva" <>
Signed-off-by: Kees Cook <>
 fs/dlm/requestqueue.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/dlm/requestqueue.c b/fs/dlm/requestqueue.c
index 036a9a0078f6..63f45c3c53a2 100644
--- a/fs/dlm/requestqueue.c
+++ b/fs/dlm/requestqueue.c
@@ -44,7 +44,8 @@ void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_message *ms)
 	e->recover_seq = ls->ls_recover_seq & 0xFFFFFFFF;
 	e->nodeid = nodeid;
-	memcpy(&e->request, ms, le16_to_cpu(ms->m_header.h_length));
+	e->request = *ms;
+	memcpy(&e->request.m_extra, ms->m_extra, length);

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