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netfilter: nfnetlink: validate nfnetlink header from batch 

Make sure there is enough room for the nfnetlink header in the
netlink messages that are part of the batch. There is a similar
check in netlink_rcv_skb().

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2015-01-04 15:20:29 +01:00
parent 8ca3f5e974
commit 9ea2aa8b7d
1 changed files with 2 additions and 1 deletions
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3
net/netfilter/nfnetlink.c
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@ -321,7 +321,8 @@ static void nfnetlink_rcv_batch(struct sk_buff *skb, struct nlmsghdr *nlh,
nlh = nlmsg_hdr(skb);
err = 0;
if (nlh->nlmsg_len < NLMSG_HDRLEN) {
if (nlmsg_len(nlh) < sizeof(struct nfgenmsg) ||
skb->len < nlh->nlmsg_len) {
err = -EINVAL;
goto ack;
}