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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        syzbot+28a246747e0a465127f3@syzkaller.appspotmail.com,
        Pavel Skripkin <paskripkin@gmail.com>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.9 31/47] drivers: net: fix memory leak in atusb_probe
Date:   Thu, 15 Apr 2021 16:47:23 +0200
Message-Id: <20210415144414.466627824@linuxfoundation.org>
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From: Pavel Skripkin <paskripkin@gmail.com>

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>
---
 drivers/net/ieee802154/atusb.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/ieee802154/atusb.c
+++ b/drivers/net/ieee802154/atusb.c
@@ -341,6 +341,7 @@ static int atusb_alloc_urbs(struct atusb
 			return -ENOMEM;
 		}
 		usb_anchor_urb(urb, &atusb->idle_urbs);
+		usb_free_urb(urb);
 		n--;
 	}
 	return 0;