From: Julian Squires Date: Mon, 6 Jul 2020 21:13:53 +0000 (-0400) Subject: cfg80211: check vendor command doit pointer before use X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4052d3d2e8f47a15053320bbcbe365d15610437d;p=linux.git cfg80211: check vendor command doit pointer before use In the case where a vendor command does not implement doit, and has no flags set, doit would not be validated and a NULL pointer dereference would occur, for example when invoking the vendor command via iw. I encountered this while developing new vendor commands. Perhaps in practice it is advisable to always implement doit along with dumpit, but it seems reasonable to me to always check doit anyway, not just when NEED_WDEV. Signed-off-by: Julian Squires Link: https://lore.kernel.org/r/20200706211353.2366470-1-julian@cipht.net Signed-off-by: Johannes Berg --- diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 0e07fb8585fb4..7fbca0854265a 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -13266,13 +13266,13 @@ static int nl80211_vendor_cmd(struct sk_buff *skb, struct genl_info *info) if (!wdev_running(wdev)) return -ENETDOWN; } - - if (!vcmd->doit) - return -EOPNOTSUPP; } else { wdev = NULL; } + if (!vcmd->doit) + return -EOPNOTSUPP; + if (info->attrs[NL80211_ATTR_VENDOR_DATA]) { data = nla_data(info->attrs[NL80211_ATTR_VENDOR_DATA]); len = nla_len(info->attrs[NL80211_ATTR_VENDOR_DATA]);