linux-kernel - [PATCH v3] media: pvrusb2: fix parsing error

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Message-Id: <20200820165239.8510-1-ztong0001@gmail.com>
Date:   Thu, 20 Aug 2020 12:52:40 -0400
From:   Tong Zhang <ztong0001@...il.com>
To:     isely@...ox.com, mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, hverkuil@...all.nl
Cc:     ztong0001@...il.com
Subject: [PATCH v3] media: pvrusb2: fix parsing error

pvr2_std_str_to_id() returns 0 on failure and 1 on success,
however the caller is checking failure case using <0

Co-developed-by: Hans Verkuil<hverkuil@...all.nl>
Signed-off-by: Tong Zhang <ztong0001@...il.com>
---

v2: return -EINVAL as suggested by Hans Verkuil<hverkuil@...all.nl>.
I also rebased the code on v5.9-rc1.
v3: remove unused variable

 drivers/media/usb/pvrusb2/pvrusb2-hdw.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
index 1cfb7cf64131..f4a727918e35 100644
--- a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
+++ b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
@@ -864,10 +864,9 @@ static int ctrl_std_sym_to_val(struct pvr2_ctrl *cptr,
 			       const char *bufPtr,unsigned int bufSize,
 			       int *mskp,int *valp)
 {
-	int ret;
 	v4l2_std_id id;
-	ret = pvr2_std_str_to_id(&id,bufPtr,bufSize);
-	if (ret < 0) return ret;
+	if (!pvr2_std_str_to_id(&id, bufPtr, bufSize))
+		return -EINVAL;
 	if (mskp) *mskp = id;
 	if (valp) *valp = id;
 	return 0;
-- 
2.25.1