diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index f7a409132e2a480a216af38f4b18442d2671b5dc..a365ea2f5484a3218f008f5a1d804280b6b51ff9 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1761,6 +1761,8 @@ static int smc_listen_prfx_check(struct smc_sock *new_smc,
 	if (pclc->hdr.typev1 == SMC_TYPE_N)
 		return 0;
 	pclc_prfx = smc_clc_proposal_get_prefix(pclc);
+	if (!pclc_prfx)
+		return -EPROTO;
 	if (smc_clc_prfx_match(newclcsock, pclc_prfx))
 		return SMC_CLC_DECL_DIFFPREFIX;
 
@@ -1917,7 +1919,9 @@ static void smc_find_ism_v1_device_serv(struct smc_sock *new_smc,
 	struct smc_clc_msg_smcd *pclc_smcd = smc_get_clc_msg_smcd(pclc);
 
 	/* check if ISM V1 is available */
-	if (!(ini->smcd_version & SMC_V1) || !smcd_indicated(ini->smc_type_v1))
+	if (!(ini->smcd_version & SMC_V1) ||
+	    !smcd_indicated(ini->smc_type_v1) ||
+	    !pclc_smcd)
 		goto not_found;
 	ini->is_smcd = true; /* prepare ISM check */
 	ini->ism_peer_gid[0] = ntohll(pclc_smcd->ism.gid);
diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
index 838470f897d0404217f5c8df6694f75c6c5bcbea..614b48c490e23dfa95b8cc642ea4cd9754ab3ad1 100644
--- a/net/smc/smc_clc.c
+++ b/net/smc/smc_clc.c
@@ -49,6 +49,10 @@ static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc)
 
 	v2_ext = smc_get_clc_v2_ext(pclc);
 	pclc_prfx = smc_clc_proposal_get_prefix(pclc);
+	if (!pclc_prfx ||
+	    pclc_prfx->ipv6_prefixes_cnt > SMC_CLC_MAX_V6_PREFIX)
+		return false;
+
 	if (hdr->version == SMC_V1) {
 		if (hdr->typev1 == SMC_TYPE_N)
 			return false;
diff --git a/net/smc/smc_clc.h b/net/smc/smc_clc.h
index 49291909ffca0902f1b95ed261809096944ace43..4b68eb626aa253bd77574b6bd5aec36762eafd88 100644
--- a/net/smc/smc_clc.h
+++ b/net/smc/smc_clc.h
@@ -259,8 +259,12 @@ struct smc_clc_msg_decline {	/* clc decline message */
 static inline struct smc_clc_msg_proposal_prefix *
 smc_clc_proposal_get_prefix(struct smc_clc_msg_proposal *pclc)
 {
+	u16 offset = ntohs(pclc->iparea_offset);
+
+	if (offset > sizeof(struct smc_clc_msg_smcd))
+		return NULL;
 	return (struct smc_clc_msg_proposal_prefix *)
-	       ((u8 *)pclc + sizeof(*pclc) + ntohs(pclc->iparea_offset));
+	       ((u8 *)pclc + sizeof(*pclc) + offset);
 }
 
 static inline bool smcr_indicated(int smc_type)