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From: Jerome Pouiller <Jerome.Pouiller@silabs.com>
To: devel@driverdev.osuosl.org, linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Kalle Valo" <kvalo@codeaurora.org>,
	"David S . Miller" <davem@davemloft.net>,
	"Dan Carpenter" <dan.carpenter@oracle.com>,
	"Jérôme Pouiller" <jerome.pouiller@silabs.com>
Subject: [PATCH 3/8] staging: wfx: standardize the error when vif does not exist
Date: Fri,  9 Oct 2020 19:13:02 +0200	[thread overview]
Message-ID: <20201009171307.864608-4-Jerome.Pouiller@silabs.com> (raw)
In-Reply-To: <20201009171307.864608-1-Jerome.Pouiller@silabs.com>

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

Smatch complains:

   drivers/staging/wfx/hif_rx.c:177 hif_scan_complete_indication() warn: potential NULL parameter dereference 'wvif'
   drivers/staging/wfx/data_tx.c:576 wfx_flush() warn: potential NULL parameter dereference 'wvif'

Indeed, if the vif id returned by the device does not exist anymore,
wdev_to_wvif() could return NULL.

In add, the error is not handled uniformly in the code, sometime a
WARN() is displayed but code continue, sometime a dev_warn() is
displayed, sometime it is just not tested, ...

This patch standardize that.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
---
 drivers/staging/wfx/data_tx.c |  5 ++++-
 drivers/staging/wfx/hif_rx.c  | 34 ++++++++++++++++++++++++----------
 drivers/staging/wfx/sta.c     |  4 ++++
 3 files changed, 32 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/wfx/data_tx.c b/drivers/staging/wfx/data_tx.c
index b4d5dd3d2d23..8db0be08daf8 100644
--- a/drivers/staging/wfx/data_tx.c
+++ b/drivers/staging/wfx/data_tx.c
@@ -431,7 +431,10 @@ static void wfx_skb_dtor(struct wfx_vif *wvif, struct sk_buff *skb)
 			      sizeof(struct hif_req_tx) +
 			      req->fc_offset;
 
-	WARN_ON(!wvif);
+	if (!wvif) {
+		pr_warn("%s: vif associated with the skb does not exist anymore\n", __func__);
+		return;
+	}
 	wfx_tx_policy_put(wvif, req->retry_policy_index);
 	skb_pull(skb, offset);
 	ieee80211_tx_status_irqsafe(wvif->wdev->hw, skb);
diff --git a/drivers/staging/wfx/hif_rx.c b/drivers/staging/wfx/hif_rx.c
index d6dfab094b03..ca09467cba05 100644
--- a/drivers/staging/wfx/hif_rx.c
+++ b/drivers/staging/wfx/hif_rx.c
@@ -110,9 +110,9 @@ static int hif_receive_indication(struct wfx_dev *wdev,
 	const struct hif_ind_rx *body = buf;
 
 	if (!wvif) {
-		dev_warn(wdev->dev, "ignore rx data for non-existent vif %d\n",
-			 hif->interface);
-		return 0;
+		dev_warn(wdev->dev, "%s: ignore rx data for non-existent vif %d\n",
+			 __func__, hif->interface);
+		return -EIO;
 	}
 	skb_pull(skb, sizeof(struct hif_msg) + sizeof(struct hif_ind_rx));
 	wfx_rx_cb(wvif, body, skb);
@@ -128,8 +128,8 @@ static int hif_event_indication(struct wfx_dev *wdev,
 	int type = le32_to_cpu(body->event_id);
 
 	if (!wvif) {
-		dev_warn(wdev->dev, "received event for non-existent vif\n");
-		return 0;
+		dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
+		return -EIO;
 	}
 
 	switch (type) {
@@ -161,7 +161,10 @@ static int hif_pm_mode_complete_indication(struct wfx_dev *wdev,
 {
 	struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
 
-	WARN_ON(!wvif);
+	if (!wvif) {
+		dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
+		return -EIO;
+	}
 	complete(&wvif->set_pm_mode_complete);
 
 	return 0;
@@ -173,7 +176,11 @@ static int hif_scan_complete_indication(struct wfx_dev *wdev,
 {
 	struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
 
-	WARN_ON(!wvif);
+	if (!wvif) {
+		dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
+		return -EIO;
+	}
+
 	wfx_scan_complete(wvif);
 
 	return 0;
@@ -185,7 +192,10 @@ static int hif_join_complete_indication(struct wfx_dev *wdev,
 {
 	struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
 
-	WARN_ON(!wvif);
+	if (!wvif) {
+		dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
+		return -EIO;
+	}
 	dev_warn(wdev->dev, "unattended JoinCompleteInd\n");
 
 	return 0;
@@ -195,11 +205,15 @@ static int hif_suspend_resume_indication(struct wfx_dev *wdev,
 					 const struct hif_msg *hif,
 					 const void *buf)
 {
-	struct wfx_vif *wvif = wdev_to_wvif(wdev, hif->interface);
 	const struct hif_ind_suspend_resume_tx *body = buf;
+	struct wfx_vif *wvif;
 
 	if (body->bc_mc_only) {
-		WARN_ON(!wvif);
+		wvif = wdev_to_wvif(wdev, hif->interface);
+		if (!wvif) {
+			dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
+			return -EIO;
+		}
 		if (body->resume)
 			wfx_suspend_resume_mc(wvif, STA_NOTIFY_AWAKE);
 		else
diff --git a/drivers/staging/wfx/sta.c b/drivers/staging/wfx/sta.c
index a246f0d1d6e9..2320a81eae0b 100644
--- a/drivers/staging/wfx/sta.c
+++ b/drivers/staging/wfx/sta.c
@@ -619,6 +619,10 @@ int wfx_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta, bool set)
 	struct wfx_sta_priv *sta_dev = (struct wfx_sta_priv *)&sta->drv_priv;
 	struct wfx_vif *wvif = wdev_to_wvif(wdev, sta_dev->vif_id);
 
+	if (!wvif) {
+		dev_warn(wdev->dev, "%s: received event for non-existent vif\n", __func__);
+		return -EIO;
+	}
 	schedule_work(&wvif->update_tim_work);
 	return 0;
 }
-- 
2.28.0


  parent reply	other threads:[~2020-10-09 17:14 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-09 17:12 [PATCH 0/8] staging: wfx: fix issues reported by Smatch Jerome Pouiller
2020-10-09 17:13 ` [PATCH 1/8] staging: wfx: improve error handling of hif_join() Jerome Pouiller
2020-10-09 17:13 ` [PATCH 2/8] staging: wfx: check memory allocation Jerome Pouiller
2020-10-09 18:51   ` Kalle Valo
2020-10-10 12:07     ` Jérôme Pouiller
2020-10-10 13:18       ` Dan Carpenter
2020-10-10 13:54         ` Dan Carpenter
2020-10-09 17:13 ` Jerome Pouiller [this message]
2020-10-09 18:52   ` [PATCH 3/8] staging: wfx: standardize the error when vif does not exist Kalle Valo
2020-10-10 12:22     ` Jérôme Pouiller
2020-10-10 12:40       ` Greg Kroah-Hartman
2020-10-10 13:29         ` Jérôme Pouiller
2020-10-09 17:13 ` [PATCH 4/8] staging: wfx: wfx_init_common() returns NULL on error Jerome Pouiller
2020-10-09 17:13 ` [PATCH 5/8] staging: wfx: increase robustness of hif_generic_confirm() Jerome Pouiller
2020-10-09 17:13 ` [PATCH 6/8] staging: wfx: gpiod_get_value() can return an error Jerome Pouiller
2020-10-09 17:13 ` [PATCH 7/8] staging: wfx: drop unicode characters from strings Jerome Pouiller
2020-10-09 17:13 ` [PATCH 8/8] staging: wfx: improve robustness of wfx_get_hw_rate() Jerome Pouiller
2020-10-16  1:50   ` Nathan Chancellor

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