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    Subject[PATCH 4.11 16/78] mac80211: fix IBSS presp allocation size
    Date
    4.11-stable review patch.  If anyone has any objections, please let me know.

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

    From: Johannes Berg <johannes.berg@intel.com>

    commit f1f3e9e2a50a70de908f9dfe0d870e9cdc67e042 upstream.

    When VHT IBSS support was added, the size of the extra elements
    wasn't considered in ieee80211_ibss_build_presp(), which makes
    it possible that it would overrun the allocated buffer. Fix it
    by allocating the necessary space.

    Fixes: abcff6ef01f9 ("mac80211: add VHT support for IBSS")
    Reported-by: Shaul Triebitz <shaul.triebitz@intel.com>
    Signed-off-by: Johannes Berg <johannes.berg@intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    net/mac80211/ibss.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/net/mac80211/ibss.c
    +++ b/net/mac80211/ibss.c
    @@ -66,6 +66,8 @@ ieee80211_ibss_build_presp(struct ieee80
    2 + (IEEE80211_MAX_SUPP_RATES - 8) +
    2 + sizeof(struct ieee80211_ht_cap) +
    2 + sizeof(struct ieee80211_ht_operation) +
    + 2 + sizeof(struct ieee80211_vht_cap) +
    + 2 + sizeof(struct ieee80211_vht_operation) +
    ifibss->ie_len;
    presp = kzalloc(sizeof(*presp) + frame_len, GFP_KERNEL);
    if (!presp)

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