From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Wed, 15 Sep 2021 13:59:52 +0000 (+0900)
Subject: ether-addr-util: make hw_addr_to_string() return valid string even if hardware addres... 
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9b52fc18b1cf9b1ddaf8597894e3099f78b5edd7;p=thirdparty%2Fsystemd.git

ether-addr-util: make hw_addr_to_string() return valid string even if hardware address is null
---

diff --git a/src/basic/ether-addr-util.c b/src/basic/ether-addr-util.c
index e660ac2c6fd..df0b1332df6 100644
--- a/src/basic/ether-addr-util.c
+++ b/src/basic/ether-addr-util.c
@@ -15,6 +15,11 @@ char* hw_addr_to_string(const struct hw_addr_data *addr, char buffer[HW_ADDR_TO_
         assert(buffer);
         assert(addr->length <= HW_ADDR_MAX_SIZE);
 
+        if (addr->length == 0) {
+                buffer[0] = '\0';
+                return buffer;
+        }
+
         for (size_t i = 0; i < addr->length; i++) {
                 sprintf(&buffer[3*i], "%02"PRIx8, addr->bytes[i]);
                 if (i < addr->length - 1)