netdev - [PATCH v2] CIPSO: Fix unaligned memory access in cipso_v4_gentag

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Message-ID: <962223cc9f1cd71814c66f563e35f53cc220f5ce.camel@yandex.ru>
Date:   Fri, 05 Mar 2021 11:05:54 +0300
From:   Sergey Nazarov <s-nazarov@...dex.ru>
To:     linux-security-module@...r.kernel.org
Cc:     paul@...l-moore.com, davem@...emloft.net, netdev@...r.kernel.org,
        Ondrej Mosnacek <omosnace@...hat.com>
Subject: [PATCH v2] CIPSO: Fix unaligned memory access in cipso_v4_gentag_hdr

We need to use put_unaligned when writing 32-bit DOI value
in cipso_v4_gentag_hdr to avoid unaligned memory access.

v2: unneeded type cast removed as Ondrej Mosnacek suggested.

Signed-off-by: Sergey Nazarov <s-nazarov@...dex.ru>
---
 net/ipv4/cipso_ipv4.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index 471d33a..6e59902 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -1162,7 +1162,7 @@ static void cipso_v4_gentag_hdr(const struct
cipso_v4_doi *doi_def,
 {
 	buf[0] = IPOPT_CIPSO;
 	buf[1] = CIPSO_V4_HDR_LEN + len;
-	*(__be32 *)&buf[2] = htonl(doi_def->doi);
+	put_unaligned_be32(doi_def->doi, &buf[2]);
 }
 
 /**
-- 
1.8.3.1