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nl80211: Check for the required netlink attribute presence

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nl80211_nan_add_func() does not check if the required attribute
NL80211_NAN_FUNC_FOLLOW_UP_DEST is present when processing
NL80211_CMD_ADD_NAN_FUNCTION request. This request can be issued
by users with CAP_NET_ADMIN privilege and may result in NULL dereference
and a system crash. Add a check for the required attribute presence.

Signed-off-by: Hao Chen <flank3rsky@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Hao Chen 2018-01-03 11:00:31 +08:00 committed by Johannes Berg
parent 820d1d5eba
commit 3ea15452ee
1 changed files with 2 additions and 1 deletions
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3
net/wireless/nl80211.c
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@ -11361,7 +11361,8 @@ static int nl80211_nan_add_func(struct sk_buff *skb,
break; break;
case NL80211_NAN_FUNC_FOLLOW_UP: case NL80211_NAN_FUNC_FOLLOW_UP:
if (!tb[NL80211_NAN_FUNC_FOLLOW_UP_ID] || if (!tb[NL80211_NAN_FUNC_FOLLOW_UP_ID] ||
!tb[NL80211_NAN_FUNC_FOLLOW_UP_REQ_ID]) { !tb[NL80211_NAN_FUNC_FOLLOW_UP_REQ_ID] ||
!tb[NL80211_NAN_FUNC_FOLLOW_UP_DEST]) {
err = -EINVAL; err = -EINVAL;
goto out; goto out;
} }