linux-kernel - [PATCH] media: atomisp: fix the uninitialized use

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Date:   Tue, 15 Jun 2021 11:45:38 -0700
From:   Yizhuo Zhai <yzhai003@....edu>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        akari.ailus@...ux.intel.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        juant.aldea@...il.com, linux-media@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH] media: atomisp: fix the uninitialized use

Inside function mt9m114_detect(), variable "retvalue" could
be uninitialized if mt9m114_read_reg() returns error, however, it
is used in the later if statement, which is potentially unsafe.

Signed-off-by: Yizhuo <yzhai003@....edu>
---
 drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
index f5de81132177..8ddddb18ffbb 100644
--- a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
+++ b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c
@@ -1534,12 +1534,15 @@ static int mt9m114_detect(struct
mt9m114_device *dev, struct i2c_client *client)
 {
        struct i2c_adapter *adapter = client->adapter;
        u32 retvalue;
+       int ret;

        if (!i2c_check_functionality(adapter, I2C_FUNC_I2C)) {
                dev_err(&client->dev, "%s: i2c error", __func__);
                return -ENODEV;
        }
-       mt9m114_read_reg(client, MISENSOR_16BIT, (u32)MT9M114_PID, &retvalue);
+       ret = mt9m114_read_reg(client, MISENSOR_16BIT,
(u32)MT9M114_PID, &retvalue);
+       if (ret)
+               return ret;
        dev->real_model_id = retvalue;

        if (retvalue != MT9M114_MOD_ID) {
-- 
2.17.1