linux-kernel - [BUG] memstick: rtsx_usb_ms: possible uninitialized-variable access in rtsx_usb_ms_issue

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Date:   Sat, 31 Jul 2021 14:36:49 +0800
From:   Li Tuo <islituo@...il.com>
To:     maximlevitsky@...il.com, oakad@...oo.com, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        baijiaju1990@...il.com
Subject: [BUG] memstick: rtsx_usb_ms: possible uninitialized-variable access
 in rtsx_usb_ms_issue_cmd()

Hello,

Our static analysis tool finds a possible uninitialized-variable access 
in the memstick driver in Linux 5.14.0-rc3:

At the beginning of the function rtsx_usb_ms_issue_cmd(), the variable 
int_reg is not initialized.
If the following condition is true, it remains uninitialized.
469:    if (req->long_data)

However, it is accessed in some statements such as:
491:    if (int_reg & MS_INT_CMDNK)

I am not quite sure whether this possible uninitialized-variable access 
is real and how to fix it if it is real.
Any feedback would be appreciated, thanks!

Reported-by: TOTE Robot <oslab@...nghua.edu.cn>

Best wishes,
Tuo Li