From: Pavel Skripkin <paskripkin@gmail.com>
Date: Thu, 1 Apr 2021 04:46:24 +0000 (+0300)
Subject: drivers: net: fix memory leak in atusb_probe
X-Git-Tag: v4.4.267~15
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4c4718482b4aae3a9387cb50fccfd00e5216b290;p=thirdparty%2Fkernel%2Fstable.git

drivers: net: fix memory leak in atusb_probe

commit 6b9fbe16955152626557ec6f439f3407b7769941 upstream.

syzbot reported memory leak in atusb_probe()[1].
The problem was in atusb_alloc_urbs().
Since urb is anchored, we need to release the reference
to correctly free the urb

backtrace:
    [<ffffffff82ba0466>] kmalloc include/linux/slab.h:559 [inline]
    [<ffffffff82ba0466>] usb_alloc_urb+0x66/0xe0 drivers/usb/core/urb.c:74
    [<ffffffff82ad3888>] atusb_alloc_urbs drivers/net/ieee802154/atusb.c:362 [inline][2]
    [<ffffffff82ad3888>] atusb_probe+0x158/0x820 drivers/net/ieee802154/atusb.c:1038 [1]

Reported-by: syzbot+28a246747e0a465127f3@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/net/ieee802154/atusb.c b/drivers/net/ieee802154/atusb.c
index d5e0e2aedc557..9b3ab60c35566 100644
--- a/drivers/net/ieee802154/atusb.c
+++ b/drivers/net/ieee802154/atusb.c
@@ -340,6 +340,7 @@ static int atusb_alloc_urbs(struct atusb *atusb, int n)
 			return -ENOMEM;
 		}
 		usb_anchor_urb(urb, &atusb->idle_urbs);
+		usb_free_urb(urb);
 		n--;
 	}
 	return 0;