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-rw-r--r--include/net.h5
-rw-r--r--net/eth_common.c2
2 files changed, 6 insertions, 1 deletions
diff --git a/include/net.h b/include/net.h
index 61568f6..c3bfb63 100644
--- a/include/net.h
+++ b/include/net.h
@@ -40,6 +40,11 @@
/* ARP hardware address length */
#define ARP_HLEN 6
+/*
+ * The size of a MAC address in string form, each digit requires two chars
+ * and five separator characters to form '00:00:00:00:00:00'.
+ */
+#define ARP_HLEN_ASCII (ARP_HLEN * 2) + (ARP_HLEN - 1)
/* IPv4 addresses are always 32 bits in size */
struct in_addr {
diff --git a/net/eth_common.c b/net/eth_common.c
index 2880901..e9d3c66 100644
--- a/net/eth_common.c
+++ b/net/eth_common.c
@@ -32,7 +32,7 @@ int eth_getenv_enetaddr(const char *name, uchar *enetaddr)
int eth_setenv_enetaddr(const char *name, const uchar *enetaddr)
{
- char buf[20];
+ char buf[ARP_HLEN_ASCII + 1];
sprintf(buf, "%pM", enetaddr);