linux-kernel - [PATCH] [media] pvrusb2: qctrl.flag will be uninitlaized if cx2341x_ctrl

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Message-Id: <20190821210931.9621-1-yzhai003@ucr.edu>
Date:   Wed, 21 Aug 2019 14:09:31 -0700
From:   Yizhuo <yzhai003@....edu>
To:     unlisted-recipients:; (no To-header on input)
Cc:     csong@...ucr.edu, zhiyunq@...ucr.edu, Yizhuo <yzhai003@....edu>,
        Mike Isely <isely@...ox.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [media] pvrusb2: qctrl.flag will be uninitlaized if cx2341x_ctrl_query() returns error code

Inside function ctrl_cx2341x_getv4lflags(), qctrl.flag
will be uninitlaized if cx2341x_ctrl_query() returns -EINVAL.
However, it will be used in the later if statement, which is
potentially unsafe.

Signed-off-by: Yizhuo <yzhai003@....edu>
---
 drivers/media/usb/pvrusb2/pvrusb2-hdw.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
index ad5b25b89699..1fa05971316a 100644
--- a/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
+++ b/drivers/media/usb/pvrusb2/pvrusb2-hdw.c
@@ -793,6 +793,7 @@ static unsigned int ctrl_cx2341x_getv4lflags(struct pvr2_ctrl *cptr)
 	struct v4l2_queryctrl qctrl;
 	struct pvr2_ctl_info *info;
 	qctrl.id = cptr->info->v4l_id;
+	memset(&qctr, 0, sizeof(qctrl))
 	cx2341x_ctrl_query(&cptr->hdw->enc_ctl_state,&qctrl);
 	/* Strip out the const so we can adjust a function pointer.  It's
 	   OK to do this here because we know this is a dynamically created
-- 
2.17.1