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lapb: fixed leak of control-blocks.

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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.

Reported-by: syzbot+afb980676c836b4a0afa@syzkaller.appspotmail.com
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jeremy Sowden 2019-06-16 16:54:37 +01:00 committed by David S. Miller
parent 5cf02612b3
commit 6be8e297f9
1 changed files with 1 additions and 0 deletions
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1
net/lapb/lapb_iface.c
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@ -177,6 +177,7 @@ int lapb_unregister(struct net_device *dev)
lapb = __lapb_devtostruct(dev);
if (!lapb)
goto out;
lapb_put(lapb);
lapb_stop_t1timer(lapb);
lapb_stop_t2timer(lapb);