Fix loading more than one certificate in PEM format in X509_load_cert…

…_file_ex()

Fixes #22895

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from #22885)

crypto/x509/by_file.c

@@ -128,6 +128,17 @@ int X509_load_cert_file_ex(X509_LOOKUP *ctx, const char *file, int type,
                 count = 0;
                 goto err;
             }
+            /*
+             * X509_STORE_add_cert() added a reference rather than a copy,
+             * so we need a fresh X509 object.
+             */
+            X509_free(x);
+            x = X509_new_ex(libctx, propq);
+            if (x == NULL) {
+                ERR_raise(ERR_LIB_X509, ERR_R_ASN1_LIB);
+                count = 0;
+                goto err;
+            }
             count++;
         }
     } else if (type == X509_FILETYPE_ASN1) {