[PATCH v4] media: atomisp: fix the uninitialized use and rename "retvalue"
From: Yizhuo Zhai <hidden>
Date: 2021-08-11 03:54:21
Also in:
linux-media, lkml
Subsystem:
intel mid (mobile internet device) platform, media input infrastructure (v4l/dvb), staging - atomisp driver, staging subsystem, the rest · Maintainers:
Andy Shevchenko, Mauro Carvalho Chehab, Hans de Goede, Greg Kroah-Hartman, Linus Torvalds
From: Yizhuo <redacted>
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 Zhai<redacted>
---
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