linux-kernel - [PATCH] Input: hideep - fix the uninitialized use in hideep_nvm

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Message-ID: <CABvMjLRuGPgEJ3Ef7=sBk3m3oa+3HuyV9mVY0ZCYuHK=rJRA4w@mail.gmail.com>
Date:   Tue, 15 Jun 2021 10:26:09 -0700
From:   Yizhuo Zhai <yzhai003@....edu>
To:     dmitry.torokhov@...il.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] Input: hideep - fix the uninitialized use in hideep_nvm_unlock()

Inside function hideep_nvm_unlock(), variable "unmask_code" could
be uninitialized if hideep_pgm_r_reg() returns error, however, it
is used in the later if statement after an "and" operation, which
is potentially unsafe.

Signed-off-by: Yizhuo <yzhai003@....edu>
---
 drivers/input/touchscreen/hideep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/hideep.c
b/drivers/input/touchscreen/hideep.c
index ddad4a82a5e5..49b713ad4384 100644
--- a/drivers/input/touchscreen/hideep.c
+++ b/drivers/input/touchscreen/hideep.c
@@ -363,7 +363,7 @@ static int hideep_enter_pgm(struct hideep_ts *ts)

 static void hideep_nvm_unlock(struct hideep_ts *ts)
 {
-       u32 unmask_code;
+       u32 unmask_code = 0;

        hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_SFR_RPAGE);
        hideep_pgm_r_reg(ts, 0x0000000C, &unmask_code);
-- 
2.17.1