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 <[email protected]> Acked-by: Paul Moore <[email protected]> Signed-off-by: David S. Miller <[email protected]>
ambv · Mar 5, 2021 · e233feb · e233feb
1 parent 8eb37ab
commit e233feb
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
@@ -1153,7 +1153,7 @@ 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]);
 }
 
 /**