linux-kernel - [PATCH] serial: mpc52xx_uart: fix null pointer dereference

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Message-Id: <1273011539-13994-1-git-send-email-agust@denx.de>
Date:	Wed,  5 May 2010 00:18:59 +0200
From:	Anatolij Gustschin <agust@...x.de>
To:	linux-kernel@...r.kernel.org
Cc:	linuxppc-dev@...abs.org, grant.likely@...retlab.ca,
	leonardo.lists@...il.com, gregkh@...e.de,
	Anatolij Gustschin <agust@...x.de>
Subject: [PATCH] serial: mpc52xx_uart: fix null pointer dereference

Commit 6acc6833510db8f72b5ef343296d97480555fda9
introduced NULL pointer dereference and kernel crash
on ppc32 machines while booting. Fix this bug now.

Reported-by: Leonardo Chiquitto <leonardo.lists@...il.com>
Signed-off-by: Anatolij Gustschin <agust@...x.de>
---
 drivers/serial/mpc52xx_uart.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/serial/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c
index a176ab4..02469c3 100644
--- a/drivers/serial/mpc52xx_uart.c
+++ b/drivers/serial/mpc52xx_uart.c
@@ -1467,7 +1467,7 @@ mpc52xx_uart_init(void)
 	/*
 	 * Map the PSC FIFO Controller and init if on MPC512x.
 	 */
-	if (psc_ops->fifoc_init) {
+	if (psc_ops && psc_ops->fifoc_init) {
 		ret = psc_ops->fifoc_init();
 		if (ret)
 			return ret;
-- 
1.7.0.4

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