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Commit 95206ea3 authored by Nikolay Aleksandrov's avatar Nikolay Aleksandrov Committed by Greg Kroah-Hartman
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net: rtnetlink: fix info leak in RTM_GETSTATS call 




[ Upstream commit ce024f42c2e28b6bce4ecc1e891b42f57f753892 ]

When RTM_GETSTATS was added the fields of its header struct were not all
initialized when returning the result thus leaking 4 bytes of information
to user-space per rtnl_fill_statsinfo call, so initialize them now. Thanks
to Alexander Potapenko for the detailed report and bisection.

Reported-by: default avatarAlexander Potapenko <glider@google.com>
Fixes: 10c9ead9 ("rtnetlink: add new RTM_GETSTATS message to dump link stats")
Signed-off-by: default avatarNikolay Aleksandrov <nikolay@cumulusnetworks.com>
Acked-by: default avatarRoopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 58b1b840

net/core/rtnetlink.c

+3 −0
Original line number Diff line number Diff line
@@ -3758,6 +3758,9 @@ static int rtnl_fill_statsinfo(struct sk_buff *skb, struct net_device *dev, 
		return -EMSGSIZE;



	ifsm = nlmsg_data(nlh);

	ifsm->family = PF_UNSPEC;

	ifsm->pad1 = 0;

	ifsm->pad2 = 0;

	ifsm->ifindex = dev->ifindex;

	ifsm->filter_mask = filter_mask;