linux-kernel - [PATCH 5.16 116/285] staging: vchiq_arm: Avoid NULL ptr deref in vchiq_dump_platform

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Date:   Tue, 12 Apr 2022 08:29:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.16 116/285] staging: vchiq_arm: Avoid NULL ptr deref in vchiq_dump_platform_instances

From: Stefan Wahren <stefan.wahren@...e.com>

[ Upstream commit aa899e686d442c63d50f4d369cc02dbbf0941cb0 ]

vchiq_get_state() can return a NULL pointer. So handle this cases and
avoid a NULL pointer derefence in vchiq_dump_platform_instances.

Reviewed-by: Nicolas Saenz Julienne <nsaenz@...nel.org>
Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
Link: https://lore.kernel.org/r/1642968143-19281-17-git-send-email-stefan.wahren@i2se.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index b9505bb51f45..de25140159e3 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -1209,6 +1209,9 @@ int vchiq_dump_platform_instances(void *dump_context)
 	int len;
 	int i;
 
+	if (!state)
+		return -ENOTCONN;
+
 	/*
 	 * There is no list of instances, so instead scan all services,
 	 * marking those that have been dumped.
-- 
2.35.1