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| author | Jeremy Sowden <jeremy@azazel.net> | 2019-06-16 17:54:37 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-06-17 05:44:20 +0200 |
| commit | 6be8e297f9bcea666ea85ac7a6cd9d52d6deaf92 (patch) | |
| tree | a883357a7dbcf3e9c81f4541ae0ad47e0c39068d | |
| parent | tipc: purge deferredq list for each grp member in tipc_group_delete (diff) | |
| download | linux-6be8e297f9bcea666ea85ac7a6cd9d52d6deaf92.tar.xz linux-6be8e297f9bcea666ea85ac7a6cd9d52d6deaf92.zip | |
lapb: fixed leak of control-blocks.
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>
| -rw-r--r-- | net/lapb/lapb_iface.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/lapb/lapb_iface.c b/net/lapb/lapb_iface.c index 03f0cd872dce..5d2d1f746b91 100644 --- a/net/lapb/lapb_iface.c +++ b/net/lapb/lapb_iface.c @@ -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); |