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net: fix infoleak in rtnetlink 

commit 5f8e44741f9f216e33736ea4ec65ca9ac03036e6 upstream.

The stack object “map” has a total size of 32 bytes. Its last 4
bytes are padding generated by compiler. These padding bytes are
not initialized and sent out via “nla_put”.

Signed-off-by: Kangjie Lu <kjlu@gatech.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Kangjie Lu 2016-05-03 16:46:24 -04:00 committed by Willy Tarreau
parent 44efbfab13
commit f9d6914217
1 changed files with 10 additions and 8 deletions
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18
net/core/rtnetlink.c
View File

@ -899,14 +899,16 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
goto nla_put_failure;
if (1) {
struct rtnl_link_ifmap map = {
.mem_start = dev->mem_start,
.mem_end = dev->mem_end,
.base_addr = dev->base_addr,
.irq = dev->irq,
.dma = dev->dma,
.port = dev->if_port,
};
struct rtnl_link_ifmap map;
memset(&map, 0, sizeof(map));
map.mem_start = dev->mem_start;
map.mem_end = dev->mem_end;
map.base_addr = dev->base_addr;
map.irq = dev->irq;
map.dma = dev->dma;
map.port = dev->if_port;
if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
goto nla_put_failure;
}