linux-kernel - [patch] mailbox: bcm-pdc: potential NULL dereference in pdc

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Date:	Thu, 4 Aug 2016 08:30:31 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Jassi Brar <jassisinghbrar@...il.com>,
	Rob Rice <rrice@...adcom.com>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] mailbox: bcm-pdc: potential NULL dereference in
 pdc_shutdown()

We can't pass NULL pointers to pdc_ring_free() so I moved the check for
NULL.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/mailbox/bcm-pdc-mailbox.c b/drivers/mailbox/bcm-pdc-mailbox.c
index cbe0c1e..c56d4d0 100644
--- a/drivers/mailbox/bcm-pdc-mailbox.c
+++ b/drivers/mailbox/bcm-pdc-mailbox.c
@@ -1191,10 +1191,11 @@ static void pdc_shutdown(struct mbox_chan *chan)
 {
 	struct pdc_state *pdcs = chan->con_priv;
 
-	if (pdcs)
-		dev_dbg(&pdcs->pdev->dev,
-			"Shutdown mailbox channel for PDC %u", pdcs->pdc_idx);
+	if (!pdcs)
+		return;
 
+	dev_dbg(&pdcs->pdev->dev,
+		"Shutdown mailbox channel for PDC %u", pdcs->pdc_idx);
 	pdc_ring_free(pdcs);
 }