Merge tag 'ipsec-next-2025-09-26' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next

Steffen Klassert says:

====================
pull request (net-next): ipsec-next 2025-09-26

1) Fix field-spanning memcpy warning in AH output.
From Charalampos Mitrodimas.

2) Replace the strcpy() calls for alg_name by strscpy().
From Miguel García.

* tag 'ipsec-next-2025-09-26' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next:
xfrm: xfrm_user: use strscpy() for alg_name
net: ipv6: fix field-spanning memcpy warning in AH output
====================

Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

net/ipv6/ah6.c

···
 
 #define AH_SKB_CB(__skb) ((struct ah_skb_cb *)&((__skb)->cb[0]))
 
+/* Helper to save IPv6 addresses and extension headers to temporary storage */
+static inline void ah6_save_hdrs(struct tmp_ext *iph_ext,
+				 struct ipv6hdr *top_iph, int extlen)
+{
+	if (!extlen)
+		return;
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+	iph_ext->saddr = top_iph->saddr;
+#endif
+	iph_ext->daddr = top_iph->daddr;
+	memcpy(&iph_ext->hdrs, top_iph + 1, extlen - sizeof(*iph_ext));
+}
+
+/* Helper to restore IPv6 addresses and extension headers from temporary storage */
+static inline void ah6_restore_hdrs(struct ipv6hdr *top_iph,
+				    struct tmp_ext *iph_ext, int extlen)
+{
+	if (!extlen)
+		return;
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+	top_iph->saddr = iph_ext->saddr;
+#endif
+	top_iph->daddr = iph_ext->daddr;
+	memcpy(top_iph + 1, &iph_ext->hdrs, extlen - sizeof(*iph_ext));
+}
+
 static void *ah_alloc_tmp(struct crypto_ahash *ahash, int nfrags,
 			  unsigned int size)
 {
···
 	memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
 	memcpy(top_iph, iph_base, IPV6HDR_BASELEN);
 
-	if (extlen) {
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-		memcpy(&top_iph->saddr, iph_ext, extlen);
-#else
-		memcpy(&top_iph->daddr, iph_ext, extlen);
-#endif
-	}
+	ah6_restore_hdrs(top_iph, iph_ext, extlen);
 
 	kfree(AH_SKB_CB(skb)->tmp);
 	xfrm_output_resume(skb->sk, skb, err);
···
 	 */
 	memcpy(iph_base, top_iph, IPV6HDR_BASELEN);
 
+	ah6_save_hdrs(iph_ext, top_iph, extlen);
 	if (extlen) {
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-		memcpy(iph_ext, &top_iph->saddr, extlen);
-#else
-		memcpy(iph_ext, &top_iph->daddr, extlen);
-#endif
 		err = ipv6_clear_mutable_options(top_iph,
 						 extlen - sizeof(*iph_ext) +
 						 sizeof(*top_iph),
···
 	memcpy(ah->auth_data, icv, ahp->icv_trunc_len);
 	memcpy(top_iph, iph_base, IPV6HDR_BASELEN);
 
-	if (extlen) {
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-		memcpy(&top_iph->saddr, iph_ext, extlen);
-#else
-		memcpy(&top_iph->daddr, iph_ext, extlen);
-#endif
-	}
+	ah6_restore_hdrs(top_iph, iph_ext, extlen);
 
 out_free:
 	kfree(iph_base);

net/xfrm/xfrm_user.c

···
 	if (!p)
 		return -ENOMEM;
 
-	strcpy(p->alg_name, algo->name);
+	strscpy(p->alg_name, algo->name);
 	*algpp = p;
 	return 0;
 }
···
 	if (!p)
 		return -ENOMEM;
 
-	strcpy(p->alg_name, algo->name);
+	strscpy(p->alg_name, algo->name);
 	x->ealg = p;
 	x->geniv = algo->uinfo.encr.geniv;
 	return 0;
···
 	if (!p)
 		return -ENOMEM;
 
-	strcpy(p->alg_name, algo->name);
+	strscpy(p->alg_name, algo->name);
 	p->alg_key_len = ualg->alg_key_len;
 	p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
 	memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
···
 	if (!p)
 		return -ENOMEM;
 
-	strcpy(p->alg_name, algo->name);
+	strscpy(p->alg_name, algo->name);
 	if (!p->alg_trunc_len)
 		p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
 
···
 	if (!p)
 		return -ENOMEM;
 
-	strcpy(p->alg_name, algo->name);
+	strscpy(p->alg_name, algo->name);
 	x->aead = p;
 	x->geniv = algo->uinfo.aead.geniv;
 	return 0;