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Date:   Thu, 20 Jun 2019 19:57:03 +0200
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,,,
        Jeremy Sowden <>,
        "David S. Miller" <>
Subject: [PATCH 4.4 66/84] lapb: fixed leak of control-blocks.

From: Jeremy Sowden <>

[ Upstream commit 6be8e297f9bcea666ea85ac7a6cd9d52d6deaf92 ]

lapb_register calls lapb_create_cb, which initializes the control-
block's ref-count to one, and __lapb_insert_cb, which increments it when
adding the new block to the list of blocks.

lapb_unregister calls __lapb_remove_cb, which decrements the ref-count
when removing control-block from the list of blocks, and calls lapb_put
itself to decrement the ref-count before returning.

However, lapb_unregister also calls __lapb_devtostruct to look up the
right control-block for the given net_device, and __lapb_devtostruct
also bumps the ref-count, which means that when lapb_unregister returns
the ref-count is still 1 and the control-block is leaked.

Call lapb_put after __lapb_devtostruct to fix leak.

Signed-off-by: Jeremy Sowden <>
Signed-off-by: David S. Miller <>
Signed-off-by: Greg Kroah-Hartman <>
 net/lapb/lapb_iface.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/lapb/lapb_iface.c
+++ b/net/lapb/lapb_iface.c
@@ -182,6 +182,7 @@ int lapb_unregister(struct net_device *d
 	lapb = __lapb_devtostruct(dev);
 	if (!lapb)
 		goto out;
+	lapb_put(lapb);

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