From: Yizhuo <yzhai003@ucr.edu> Cc: Yizhuo <yzhai003@ucr.edu>, Mauro Carvalho Chehab <mchehab@kernel.org>, Sakari Ailus <sakari.ailus@linux.intel.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Juan Antonio Aldea-Armenteros <juant.aldea@gmail.com>, linux-media@vger.kernel.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v4] media: atomisp: fix the uninitialized use and rename "retvalue" Date: Fri, 23 Jul 2021 00:36:04 +0000 [thread overview] Message-ID: <20210723003607.64179-1-yzhai003@ucr.edu> (raw) In-Reply-To: <20210723085145.1ce7ee5c@canb.auug.org.au> 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. The local variable "retvalue" is renamed to "model" to avoid confusion. Fixes: ad85094b293e ("Revert "media: staging: atomisp: Remove driver"") Signed-off-by: Yizhuo <yzhai003@ucr.edu> --- drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c index f5de81132177..77293579a134 100644 --- a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c +++ b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c @@ -1533,16 +1533,19 @@ static struct v4l2_ctrl_config mt9m114_controls[] = { static int mt9m114_detect(struct mt9m114_device *dev, struct i2c_client *client) { struct i2c_adapter *adapter = client->adapter; - u32 retvalue; + u32 model; + 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); - dev->real_model_id = retvalue; + ret = mt9m114_read_reg(client, MISENSOR_16BIT, MT9M114_PID, &model); + if (ret) + return ret; + dev->real_model_id = model; - if (retvalue != MT9M114_MOD_ID) { + if (model != MT9M114_MOD_ID) { dev_err(&client->dev, "%s: failed: client->addr = %x\n", __func__, client->addr); return -ENODEV; -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Yizhuo <yzhai003@ucr.edu> To: unlisted-recipients:; (no To-header on input) Cc: Yizhuo <yzhai003@ucr.edu>, Mauro Carvalho Chehab <mchehab@kernel.org>, Sakari Ailus <sakari.ailus@linux.intel.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Juan Antonio Aldea-Armenteros <juant.aldea@gmail.com>, linux-media@vger.kernel.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v4] media: atomisp: fix the uninitialized use and rename "retvalue" Date: Fri, 23 Jul 2021 00:36:04 +0000 [thread overview] Message-ID: <20210723003607.64179-1-yzhai003@ucr.edu> (raw) In-Reply-To: <20210723085145.1ce7ee5c@canb.auug.org.au> 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. The local variable "retvalue" is renamed to "model" to avoid confusion. Fixes: ad85094b293e ("Revert "media: staging: atomisp: Remove driver"") Signed-off-by: Yizhuo <yzhai003@ucr.edu> --- drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c index f5de81132177..77293579a134 100644 --- a/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c +++ b/drivers/staging/media/atomisp/i2c/atomisp-mt9m114.c @@ -1533,16 +1533,19 @@ static struct v4l2_ctrl_config mt9m114_controls[] = { static int mt9m114_detect(struct mt9m114_device *dev, struct i2c_client *client) { struct i2c_adapter *adapter = client->adapter; - u32 retvalue; + u32 model; + 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); - dev->real_model_id = retvalue; + ret = mt9m114_read_reg(client, MISENSOR_16BIT, MT9M114_PID, &model); + if (ret) + return ret; + dev->real_model_id = model; - if (retvalue != MT9M114_MOD_ID) { + if (model != MT9M114_MOD_ID) { dev_err(&client->dev, "%s: failed: client->addr = %x\n", __func__, client->addr); return -ENODEV; -- 2.17.1
next prev parent reply other threads:[~2021-07-23 0:35 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-22 22:51 linux-next: Fixes tag needs some work in the v4l-dvb-next tree Stephen Rothwell 2021-07-23 0:36 ` Yizhuo [this message] 2021-07-23 0:36 ` [PATCH v4] media: atomisp: fix the uninitialized use and rename "retvalue" Yizhuo 2021-07-23 8:10 ` Dan Carpenter 2021-07-23 9:19 ` Yizhuo Zhai 2021-07-23 9:19 ` Yizhuo Zhai 2021-08-11 3:54 ` Yizhuo Zhai 2021-08-11 3:54 ` Yizhuo Zhai 2021-08-11 4:19 ` Yizhuo Zhai 2021-08-11 4:19 ` Yizhuo Zhai 2021-08-11 7:01 ` Greg Kroah-Hartman 2021-08-12 5:50 ` Yizhuo Zhai 2021-08-12 5:50 ` Yizhuo Zhai 2021-08-12 5:54 ` Yizhuo Zhai 2021-08-12 5:54 ` Yizhuo Zhai 2021-08-12 6:52 ` Sakari Ailus 2021-08-12 6:52 ` Greg Kroah-Hartman 2021-08-12 7:34 ` Yizhuo Zhai 2021-08-12 7:34 ` Yizhuo Zhai 2021-08-12 7:46 ` Greg Kroah-Hartman 2021-07-23 0:38 ` linux-next: Fixes tag needs some work in the v4l-dvb-next tree Yizhuo Zhai 2021-07-23 0:58 ` Stephen Rothwell 2021-07-23 2:19 ` Yizhuo Zhai 2021-07-23 7:04 ` Mauro Carvalho Chehab
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