From: Xin Long <lucien.xin@gmail.com>
Date: Wed, 19 Apr 2023 15:16:32 +0000 (-0400)
Subject: sctp: delete the nested flexible array hmac
X-Git-Tag: v6.4-rc1~77^2~68^2~1
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=2ab399a931dddacdf7202cd4b49a5187154623d1;p=tomoyo%2Ftomoyo-test1.git

sctp: delete the nested flexible array hmac

This patch deletes the flexible-array hmac[] from the structure
sctp_authhdr to avoid some sparse warnings:

  # make C=2 CF="-Wflexible-array-nested" M=./net/sctp/
  net/sctp/auth.c: note: in included file (through include/net/sctp/structs.h, include/net/sctp/sctp.h):
  ./include/linux/sctp.h:735:29: warning: nested flexible array

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index 01a0eb7e9fa1..d182e8c41985 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -727,7 +727,7 @@ struct sctp_addip_chunk {
 struct sctp_authhdr {
 	__be16 shkey_id;
 	__be16 hmac_id;
-	__u8   hmac[];
+	/* __u8   hmac[]; */
 };
 
 struct sctp_auth_chunk {
diff --git a/net/sctp/auth.c b/net/sctp/auth.c
index 34964145514e..c58fffc86a0c 100644
--- a/net/sctp/auth.c
+++ b/net/sctp/auth.c
@@ -738,7 +738,7 @@ void sctp_auth_calculate_hmac(const struct sctp_association *asoc,
 
 	tfm = asoc->ep->auth_hmacs[hmac_id];
 
-	digest = auth->auth_hdr.hmac;
+	digest = (u8 *)(&auth->auth_hdr + 1);
 	if (crypto_shash_setkey(tfm, &asoc_key->data[0], asoc_key->len))
 		goto free;
 
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 7b8eb735fa88..97f1155a2045 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -4391,7 +4391,7 @@ static enum sctp_ierror sctp_sf_authenticate(
 	 *  3. Compute the new digest
 	 *  4. Compare saved and new digests.
 	 */
-	digest = auth_hdr->hmac;
+	digest = (u8 *)(auth_hdr + 1);
 	skb_pull(chunk->skb, sig_len);
 
 	save_digest = kmemdup(digest, sig_len, GFP_ATOMIC);