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-rw-r--r--crypto/asn1/ameth_lib.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/crypto/asn1/ameth_lib.c b/crypto/asn1/ameth_lib.c
index 43ddebba33..8f490718e1 100644
--- a/crypto/asn1/ameth_lib.c
+++ b/crypto/asn1/ameth_lib.c
@@ -305,6 +305,18 @@ EVP_PKEY_ASN1_METHOD *EVP_PKEY_asn1_new(int id, int flags,
} else
ameth->info = NULL;
+ /*
+ * One of the following must be true:
+ *
+ * pem_str == NULL AND ASN1_PKEY_ALIAS is set
+ * pem_str != NULL AND ASN1_PKEY_ALIAS is clear
+ *
+ * Anything else is an error and may lead to a corrupt ASN1 method table
+ */
+ if (!((pem_str == NULL && (flags & ASN1_PKEY_ALIAS) != 0)
+ || (pem_str != NULL && (flags & ASN1_PKEY_ALIAS) == 0)))
+ goto err;
+
if (pem_str) {
ameth->pem_str = BUF_strdup(pem_str);
if (!ameth->pem_str)