oberthur: fixed Heap-buffer-overflow

fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32149

src/libopensc/pkcs15-oberthur.c

@@ -616,12 +616,14 @@ sc_pkcs15emu_oberthur_add_pubkey(struct sc_pkcs15_card *p15card,
 	offs += 2 + len;
 
 	/* ID */
-	if (offs > info_len) {
+	if (offs + 2 > info_len) {
 		free(info_blob);
 		LOG_TEST_RET(ctx, SC_ERROR_UNKNOWN_DATA_RECEIVED, "Failed to add public key: no 'ID'");
 	}
 	len = *(info_blob + offs + 1) + *(info_blob + offs) * 0x100;
-	if (!len || len > sizeof(key_info.id.value)) {
+	if (len == 0
+			|| len > sizeof(key_info.id.value)
+			|| offs + 2 + len > info_len) {
 		free(info_blob);
 		LOG_TEST_RET(ctx, SC_ERROR_INVALID_DATA, "Failed to add public key: invalid 'ID' length");
 	}