linux-kernel - [PATCH] media: staging: atomisp: fix the uninitialized use in gc2235

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Date:   Sun, 11 Jul 2021 13:23:32 -0700
From:   Yizhuo <yzhai003@....edu>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Yizhuo <yzhai003@....edu>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH] media: staging: atomisp: fix the uninitialized use in gc2235_detect()

Inside function gc2235_detect(), variable "low" could be uninitialized
if ov5693_read_reg() returns error, however, it affects the value of
variable "id". The "id" is used in the later if statement, which is
potentially unsafe.

Signed-off-by: Yizhuo <yzhai003@....edu>
---
 drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c b/drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c
index e698b63d6cb7..a899e806dfcd 100644
--- a/drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c
+++ b/drivers/staging/media/atomisp/i2c/ov5693/atomisp-ov5693.c
@@ -1714,6 +1714,8 @@ static int ov5693_detect(struct i2c_client *client)
 	}
 	ret = ov5693_read_reg(client, OV5693_8BIT,
 			      OV5693_SC_CMMN_CHIP_ID_L, &low);
+	if (ret)
+		return ret;
 	id = ((((u16)high) << 8) | (u16)low);
 
 	if (id != OV5693_ID) {
-- 
2.32.0