linux-kernel - [PATCH 1/2] mailbox: Avoid NULL-pointer dereference in mbox_chan_received

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Message-Id: <1414699267-17970-1-git-send-email-abrestic@chromium.org>
Date:	Thu, 30 Oct 2014 13:01:06 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Jassi Brar <jassisinghbrar@...il.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Andrew Bresticker <abrestic@...omium.org>
Subject: [PATCH 1/2] mailbox: Avoid NULL-pointer dereference in mbox_chan_received_data()

If a message has been received on a channel, but no client has yet bound
to it, mbox_chan_received_data() will dereference a NULL client pointer.
Check for the presence of a client first.

Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
---
 drivers/mailbox/mailbox.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index afcb430..5008028 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -142,7 +142,7 @@ static void poll_txdone(unsigned long data)
 void mbox_chan_received_data(struct mbox_chan *chan, void *mssg)
 {
 	/* No buffering the received data */
-	if (chan->cl->rx_callback)
+	if (chan->cl && chan->cl->rx_callback)
 		chan->cl->rx_callback(chan->cl, mssg);
 }
 EXPORT_SYMBOL_GPL(mbox_chan_received_data);
-- 
2.1.0.rc2.206.gedb03e5

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