[PATCH 5.14 115/334] media: go7007: fix memory leak in go7007_usb_probe

Greg Kroah-Hartman
2021-09-13T14:31:17Z

From: Pavel Skripkin <paskripkin@gmail.com>

[ Upstream commit 47d94dad8e64b2fc1d8f66ce7acf714f9462c60f ]

In commit 137641287eb4 ("go7007: add sanity checking for endpoints")
endpoint sanity check was introduced, but if check fails it simply
returns with leaked pointers.

Cutted log from my local syzbot instance:

BUG: memory leak
unreferenced object 0xffff8880209f0000 (size 8192):
comm "kworker/0:4", pid 4916, jiffies 4295263583 (age 29.310s)
hex dump (first 32 bytes):
30 b0 27 22 80 88 ff ff 75 73 62 2d 64 75 6d 6d 0.'"....usb-dumm
79 5f 68 63 64 2e 33 2d 31 00 00 00 00 00 00 00 y_hcd.3-1.......
backtrace:
[<ffffffff860ca856>] kmalloc include/linux/slab.h:556 [inline]
[<ffffffff860ca856>] kzalloc include/linux/slab.h:686 [inline]
[<ffffffff860ca856>] go7007_alloc+0x46/0xb40 drivers/media/usb/go7007/go7007-driver.c:696
[<ffffffff860de74e>] go7007_usb_probe+0x13e/0x2200 drivers/media/usb/go7007/go7007-usb.c:1114
[<ffffffff854a5f74>] usb_probe_interface+0x314/0x7f0 drivers/usb/core/driver.c:396
[<ffffffff845a7151>] really_probe+0x291/0xf60 drivers/base/dd.c:576

BUG: memory leak
unreferenced object 0xffff88801e2f2800 (size 512):
comm "kworker/0:4", pid 4916, jiffies 4295263583 (age 29.310s)
hex dump (first 32 bytes):
00 87 40 8a ff ff ff ff 00 00 00 00 00 00 00 00 ..@.............
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff860de794>] kmalloc include/linux/slab.h:556 [inline]
[<ffffffff860de794>] kzalloc include/linux/slab.h:686 [inline]
[<ffffffff860de794>] go7007_usb_probe+0x184/0x2200 drivers/media/usb/go7007/go7007-usb.c:1118
[<ffffffff854a5f74>] usb_probe_interface+0x314/0x7f0 drivers/usb/core/driver.c:396
[<ffffffff845a7151>] really_probe+0x291/0xf60 drivers/base/dd.c:576

Fixes: 137641287eb4 ("go7007: add sanity checking for endpoints")
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/usb/go7007/go7007-usb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/go7007/go7007-usb.c b/drivers/media/usb/go7007/go7007-usb.c
index dbf0455d5d50..eeb85981e02b 100644
--- a/drivers/media/usb/go7007/go7007-usb.c
+++ b/drivers/media/usb/go7007/go7007-usb.c
@@ -1134,7 +1134,7 @@ static int go7007_usb_probe(struct usb_interface *intf,

ep = usb->usbdev->ep_in[4];
if (!ep)
- return -ENODEV;
+ goto allocfail;

/* Allocate the URB and buffer for receiving incoming interrupts */
usb->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
--
2.30.2