linux-kernel - [PATCH AUTOSEL 4.19 28/39] Input: hideep - fix the uninitialized use in hideep_nvm

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Message-Id: <20210710023204.3171428-28-sashal@kernel.org>
Date:   Fri,  9 Jul 2021 22:31:53 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yizhuo Zhai <yzhai003@....edu>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Sasha Levin <sashal@...nel.org>, linux-input@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 28/39] Input: hideep - fix the uninitialized use in hideep_nvm_unlock()

From: Yizhuo Zhai <yzhai003@....edu>

[ Upstream commit cac7100d4c51c04979dacdfe6c9a5e400d3f0a27 ]

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>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/input/touchscreen/hideep.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/input/touchscreen/hideep.c b/drivers/input/touchscreen/hideep.c
index f1cd4dd9a4a3..d7775db0b711 100644
--- a/drivers/input/touchscreen/hideep.c
+++ b/drivers/input/touchscreen/hideep.c
@@ -364,13 +364,16 @@ static int hideep_enter_pgm(struct hideep_ts *ts)
 	return -EIO;
 }
 
-static void hideep_nvm_unlock(struct hideep_ts *ts)
+static int hideep_nvm_unlock(struct hideep_ts *ts)
 {
 	u32 unmask_code;
+	int error;
 
 	hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_SFR_RPAGE);
-	hideep_pgm_r_reg(ts, 0x0000000C, &unmask_code);
+	error = hideep_pgm_r_reg(ts, 0x0000000C, &unmask_code);
 	hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_DEFAULT_PAGE);
+	if (error)
+		return error;
 
 	/* make it unprotected code */
 	unmask_code &= ~HIDEEP_PROT_MODE;
@@ -387,6 +390,8 @@ static void hideep_nvm_unlock(struct hideep_ts *ts)
 	NVM_W_SFR(HIDEEP_NVM_MASK_OFS, ts->nvm_mask);
 	SET_FLASH_HWCONTROL();
 	hideep_pgm_w_reg(ts, HIDEEP_FLASH_CFG, HIDEEP_NVM_DEFAULT_PAGE);
+
+	return 0;
 }
 
 static int hideep_check_status(struct hideep_ts *ts)
@@ -465,7 +470,9 @@ static int hideep_program_nvm(struct hideep_ts *ts,
 	u32 addr = 0;
 	int error;
 
-	hideep_nvm_unlock(ts);
+       error = hideep_nvm_unlock(ts);
+       if (error)
+               return error;
 
 	while (ucode_len > 0) {
 		xfer_len = min_t(size_t, ucode_len, HIDEEP_NVM_PAGE_SIZE);
-- 
2.30.2