From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 4 Aug 2016 05:30:31 +0000 (+0300)
Subject: mailbox: bcm-pdc: potential NULL dereference in pdc_shutdown()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=068cf29eca4ef25556496635b978143b170b862c;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

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@oracle.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
---

diff --git a/drivers/mailbox/bcm-pdc-mailbox.c b/drivers/mailbox/bcm-pdc-mailbox.c
index cbe0c1ee4ba9..c56d4d0b2307 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);
 }