net: use scnprintf() to avoid potential buffer overflow
strlcpy() returns the total length of the string they tried to create, so
we should not use its return value without any check. scnprintf() returns
the number of characters written into @buf not including the trailing '\0',
so use it instead here.
Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 215c839..85e7b45 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -367,7 +367,7 @@
EXPORT_SYMBOL(alloc_etherdev_mq);
static size_t _format_mac_addr(char *buf, int buflen,
- const unsigned char *addr, int len)
+ const unsigned char *addr, int len)
{
int i;
char *cp = buf;
@@ -376,7 +376,7 @@
cp += scnprintf(cp, buflen - (cp - buf), "%02x", addr[i]);
if (i == len - 1)
break;
- cp += strlcpy(cp, ":", buflen - (cp - buf));
+ cp += scnprintf(cp, buflen - (cp - buf), ":");
}
return cp - buf;
}
@@ -386,7 +386,7 @@
size_t l;
l = _format_mac_addr(buf, PAGE_SIZE, addr, len);
- l += strlcpy(buf + l, "\n", PAGE_SIZE - l);
+ l += scnprintf(buf + l, PAGE_SIZE - l, "\n");
return ((ssize_t) l);
}
EXPORT_SYMBOL(sysfs_format_mac);