linux-kernel - hwmon: (sis5595) potential null pointer dereference in probe

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Date:   Tue, 04 Aug 2020 14:50:01 +0300
From:   Evgeny Novikov <novikov@...ras.ru>
To:     Jean Delvare <jdelvare@...e.com>
Cc:     Guenter Roeck <linux@...ck-us.net>, linux-hwmon@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: hwmon: (sis5595) potential null pointer dereference in probe

sis5595_pci_probe() registers platform driver callbacks and just then
initializes global pointer variable s_bridge. sis5595_probe() may
dereference it before this happens that can result in null pointer
dereference.

We can not swap registration of platform driver callbacks with
initialization of s_bridge since sm_sis5595_exit() assumes the
current order. Perhaps it has sense to implement a pci_driver.remove
callback that will take care about deregistration of platform driver
callbacks.

Found by Linux Driver Verification project (linuxtesting.org).