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ipv4: ARP neigh procfs buffer overflow

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If arp_format_neigh_entry() can be called with n->dev->addr_len == 0, then a
write to hbuffer[-1] occurs.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
roel kluin 2009-07-29 23:46:59 +00:00 committed by David S. Miller
parent 3d54015b75
commit a3e8ee6820
1 changed files with 3 additions and 1 deletions
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4
net/ipv4/arp.c
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@ -1304,7 +1304,9 @@ static void arp_format_neigh_entry(struct seq_file *seq,
hbuffer[k++] = hex_asc_lo(n->ha[j]);
hbuffer[k++] = ':';
}
hbuffer[--k] = 0;
if (k != 0)
--k;
hbuffer[k] = 0;
#if defined(CONFIG_AX25) || defined(CONFIG_AX25_MODULE)
}
#endif