netdev - [PATCH 1/8] staging: wfx: improve error handling of hif

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Date:   Fri,  9 Oct 2020 19:13:00 +0200
From:   Jerome Pouiller <Jerome.Pouiller@...abs.com>
To:     devel@...verdev.osuosl.org, linux-wireless@...r.kernel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Jérôme Pouiller 
        <jerome.pouiller@...abs.com>
Subject: [PATCH 1/8] staging: wfx: improve error handling of hif_join()

From: Jérôme Pouiller <jerome.pouiller@...abs.com>

Smatch complains:

   hif_tx.c:319 hif_join() error: we previously assumed 'channel' could be null (see line 315)
   311          if (!hif)
   312                  return -ENOMEM;
   313          body->infrastructure_bss_mode = !conf->ibss_joined;
   314          body->short_preamble = conf->use_short_preamble;
   315          if (channel && channel->flags & IEEE80211_CHAN_NO_IR)
                    ^^^^^^^
   316                  body->probe_for_join = 0;
   317          else
   318                  body->probe_for_join = 1;
   319          body->channel_number = channel->hw_value;
                                       ^^^^^^^^^^^^^^^^^
   320          body->beacon_interval = cpu_to_le32(conf->beacon_int);
   321          body->basic_rate_set =

Indeed, channel can't be NULL (else I would have seen plenty of Ooops
this past year). This patch explicitly claims this restriction.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
---
 drivers/staging/wfx/hif_tx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/wfx/hif_tx.c b/drivers/staging/wfx/hif_tx.c
index e61cc2486761..63b437261eb7 100644
--- a/drivers/staging/wfx/hif_tx.c
+++ b/drivers/staging/wfx/hif_tx.c
@@ -308,11 +308,13 @@ int hif_join(struct wfx_vif *wvif, const struct ieee80211_bss_conf *conf,
 	WARN_ON(!conf->basic_rates);
 	WARN_ON(sizeof(body->ssid) < ssidlen);
 	WARN(!conf->ibss_joined && !ssidlen, "joining an unknown BSS");
+	if (WARN_ON(!channel))
+		return -EINVAL;
 	if (!hif)
 		return -ENOMEM;
 	body->infrastructure_bss_mode = !conf->ibss_joined;
 	body->short_preamble = conf->use_short_preamble;
-	if (channel && channel->flags & IEEE80211_CHAN_NO_IR)
+	if (channel->flags & IEEE80211_CHAN_NO_IR)
 		body->probe_for_join = 0;
 	else
 		body->probe_for_join = 1;
-- 
2.28.0