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net: dev_addr_init() fix

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commit f001fde5eadd915f4858d22ed70d7040f48767cf
(net: introduce a list of device addresses dev_addr_list (v6))
added one regression Vegard Nossum found in its testings.

With kmemcheck help, Vegard found some uninitialized memory
was read and reported to user, potentialy leaking kernel data.
( thread can be found on http://lkml.org/lkml/2009/5/30/177 )

dev_addr_init() incorrectly uses sizeof() operator. We were
initializing one byte instead of MAX_ADDR_LEN bytes.

Reported-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2009-06-08 03:49:24 +00:00 committed by David S. Miller
parent ebc8d2ab61
commit 0c27922e49
1 changed files with 2 additions and 2 deletions
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4
net/core/dev.c
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@ -3655,8 +3655,8 @@ static int dev_addr_init(struct net_device *dev)
/* rtnl_mutex must be held here */ /* rtnl_mutex must be held here */
INIT_LIST_HEAD(&dev->dev_addr_list); INIT_LIST_HEAD(&dev->dev_addr_list);
memset(addr, 0, sizeof(*addr)); memset(addr, 0, sizeof(addr));
err = __hw_addr_add(&dev->dev_addr_list, NULL, addr, sizeof(*addr), err = __hw_addr_add(&dev->dev_addr_list, NULL, addr, sizeof(addr),
NETDEV_HW_ADDR_T_LAN); NETDEV_HW_ADDR_T_LAN);
if (!err) { if (!err) {
/* /*