diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index fce0b87c2b65..48c53f488e0f 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -584,6 +584,8 @@ static int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con)
 			if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
 				return -EINVAL;
 			con->aead_assoclen = *(u32 *)CMSG_DATA(cmsg);
+			if (con->aead_assoclen >= 0x80000000u)
+				return -EINVAL;
 			break;
 
 		default: