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    Subject[ 16/32] connector: use nlmsg_len() to check message length
    Date
    3.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Mathias Krause <minipli@googlemail.com>

    [ Upstream commit 162b2bedc084d2d908a04c93383ba02348b648b0 ]

    The current code tests the length of the whole netlink message to be
    at least as long to fit a cn_msg. This is wrong as nlmsg_len includes
    the length of the netlink message header. Use nlmsg_len() instead to
    fix this "off-by-NLMSG_HDRLEN" size check.

    Signed-off-by: Mathias Krause <minipli@googlemail.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/connector/connector.c | 7 ++++---
    1 file changed, 4 insertions(+), 3 deletions(-)

    --- a/drivers/connector/connector.c
    +++ b/drivers/connector/connector.c
    @@ -157,17 +157,18 @@ static int cn_call_callback(struct sk_bu
    static void cn_rx_skb(struct sk_buff *__skb)
    {
    struct nlmsghdr *nlh;
    - int err;
    struct sk_buff *skb;
    + int len, err;

    skb = skb_get(__skb);

    if (skb->len >= NLMSG_SPACE(0)) {
    nlh = nlmsg_hdr(skb);
    + len = nlmsg_len(nlh);

    - if (nlh->nlmsg_len < sizeof(struct cn_msg) ||
    + if (len < (int)sizeof(struct cn_msg) ||
    skb->len < nlh->nlmsg_len ||
    - nlh->nlmsg_len > CONNECTOR_MAX_MSG_SIZE) {
    + len > CONNECTOR_MAX_MSG_SIZE) {
    kfree_skb(skb);
    return;
    }



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