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 v3] media: atomisp: fix the uninitialized use and rename "retvalue"
Date: Fri, 25 Jun 2021 05:38:56 +0000 [thread overview]
Message-ID: <20210625053858.3862-1-yzhai003@ucr.edu> (raw)
In-Reply-To: <20210624031719.11157-1-yzhai003@ucr.edu>
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: ad85094 (media / atomisp: fix the uninitialized use of model ID)
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:[~2021-06-25 5:37 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-24 3:17 [PATCH v2] media: atomisp: fix the uninitialized use and rename "retvalue" Yizhuo
2021-06-24 9:03 ` Sakari Ailus
2021-06-24 9:31 ` Dan Carpenter
2021-06-25 5:38 ` Yizhuo [this message]
2021-07-17 21:50 ` [PATCH v3] " Yizhuo Zhai
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