linux-kernel - Re: [PATCH] net: mwifiex: fix a missing check of ssid

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Date:   Mon, 25 Mar 2019 11:30:41 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     Kangjie Lu <kjlu@....edu>
Cc:     pakki001@....edu, Amitkumar Karwar <amitkarwar@...il.com>,
        Nishant Sarmukadam <nishants@...vell.com>,
        Ganapathi Bhat <gbhat@...vell.com>,
        Xinming Hu <huxinming820@...il.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        "<netdev@...r.kernel.org>" <netdev@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: mwifiex: fix a missing check of ssid

On Sat, Mar 23, 2019 at 3:34 PM Kangjie Lu <kjlu@....edu> wrote:
> sme->ssid may be invalid and thus should be checked.

Under what conditions are you seeing this? I see that brcmfmac, for
one, also has a similar check, but IIUC, the connect API always
pre-checks that there's an SSID provided:

static int nl80211_connect(struct sk_buff *skb, struct genl_info *info)
{
        struct cfg80211_registered_device *rdev = info->user_ptr[0];
        struct net_device *dev = info->user_ptr[1];
        struct cfg80211_connect_params connect;
        struct wiphy *wiphy;
        struct cfg80211_cached_keys *connkeys = NULL;
        int err;

        memset(&connect, 0, sizeof(connect));

        if (!info->attrs[NL80211_ATTR_SSID] ||
            !nla_len(info->attrs[NL80211_ATTR_SSID]))
                return -EINVAL;
...
        connect.ssid = nla_data(info->attrs[NL80211_ATTR_SSID]);


So this patch shouldn't be necessary.

Perhaps I'm missing something though.

Regards,
Brian