package/kernel/mac80211/patches/385-cfg80211-nl80211_update_ft_ies-to-validate-NL80211_A.patch

   1 From: Arunk Khandavalli <akhandav@codeaurora.org>
   2 Date: Thu, 30 Aug 2018 00:40:16 +0300
   3 Subject: [PATCH] cfg80211: nl80211_update_ft_ies() to validate
   4  NL80211_ATTR_IE
   5
   6 nl80211_update_ft_ies() tried to validate NL80211_ATTR_IE with
   7 is_valid_ie_attr() before dereferencing it, but that helper function
   8 returns true in case of NULL pointer (i.e., attribute not included).
   9 This can result to dereferencing a NULL pointer. Fix that by explicitly
  10 checking that NL80211_ATTR_IE is included.
  11
  12 Fixes: 355199e02b83 ("cfg80211: Extend support for IEEE 802.11r Fast BSS Transition")
  13 Signed-off-by: Arunk Khandavalli <akhandav@codeaurora.org>
  14 Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
  15 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  16 ---
  17
  18 --- a/net/wireless/nl80211.c
  19 +++ b/net/wireless/nl80211.c
  20 @@ -11763,6 +11763,7 @@ static int nl80211_update_ft_ies(struct
  21                 return -EOPNOTSUPP;
  22
  23         if (!info->attrs[NL80211_ATTR_MDID] ||
  24 +           !info->attrs[NL80211_ATTR_IE] ||
  25             !is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
  26                 return -EINVAL;
  27