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net: use scnprintf() to avoid potential buffer overflow

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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>
This commit is contained in:
Changli Gao 2010-08-24 13:32:58 +00:00 committed by David S. Miller
parent 145ce502e4
commit 53f91dc1f7
1 changed files with 3 additions and 3 deletions
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6
net/ethernet/eth.c
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@ -367,7 +367,7 @@ struct net_device *alloc_etherdev_mq(int sizeof_priv, unsigned int queue_count)
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 @@ static size_t _format_mac_addr(char *buf, int buflen,
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 @@ ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len)
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);