linux-kernel - [PATCH] vc04_services: vchiq_arm: fix a NULL pointer dereference

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Message-Id: <20190324224331.1163-1-kjlu@umn.edu>
Date:   Sun, 24 Mar 2019 17:43:30 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Eric Anholt <eric@...olt.net>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dominic Braun <inf.braun@....de>,
        Tobias Büttner <tobias.buettner@....de>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Phil Elwell <phil@...pberrypi.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] vc04_services: vchiq_arm: fix a NULL pointer dereference

When kzalloc fails, "platform_state->inited = 1" is a NULL pointer
dereference. The fix returns VCHIQ_ERROR in case it failed to
avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 .../staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c  | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
index dd4898861b83..0f12fe617575 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
@@ -209,6 +209,8 @@ vchiq_platform_init_state(struct vchiq_state *state)
 	struct vchiq_2835_state *platform_state;
 
 	state->platform_state = kzalloc(sizeof(*platform_state), GFP_KERNEL);
+	if (!state->platform_state)
+		return VCHIQ_ERROR;
 	platform_state = (struct vchiq_2835_state *)state->platform_state;
 
 	platform_state->inited = 1;
-- 
2.17.1