From 649cd16c438f51d4cd777e71ca1f47f6e0c5e65d Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang@huawei.com>
Date: Tue, 24 Sep 2019 06:49:04 -0300
Subject: [PATCH] media: flexcop-usb: fix NULL-ptr deref in
flexcop_usb_transfer_init()
Git-commit: 649cd16c438f51d4cd777e71ca1f47f6e0c5e65d
References: git-fixes
Patch-mainline: v5.10-rc1
If usb_set_interface() failed, iface->cur_altsetting will
not be assigned and it will be used in flexcop_usb_transfer_init()
It may lead a NULL pointer dereference.
Check usb_set_interface() return value in flexcop_usb_init()
and return failed to avoid using this NULL pointer.
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
drivers/media/usb/b2c2/flexcop-usb.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/media/usb/b2c2/flexcop-usb.c b/drivers/media/usb/b2c2/flexcop-usb.c
index 1826ff825c2e..4bf85e9b78b8 100644
--- a/drivers/media/usb/b2c2/flexcop-usb.c
+++ b/drivers/media/usb/b2c2/flexcop-usb.c
@@ -504,7 +504,13 @@ static int flexcop_usb_transfer_init(struct flexcop_usb *fc_usb)
static int flexcop_usb_init(struct flexcop_usb *fc_usb)
{
/* use the alternate setting with the larges buffer */
- usb_set_interface(fc_usb->udev,0,1);
+ int ret = usb_set_interface(fc_usb->udev, 0, 1);
+
+ if (ret) {
+ err("set interface failed.");
+ return ret;
+ }
+
switch (fc_usb->udev->speed) {
case USB_SPEED_LOW:
err("cannot handle USB speed because it is too slow.");
--
2.42.0