bonding: fix bond_arp_rcv() race of curr_active_slave

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bond->curr_active_slave can be changed between its deferences, even to
NULL, and thus we might panic.

We're always holding the rcu (rx_handler->bond_handle_frame()->bond_arp_rcv())
so fix this by rcu_dereferencing() it and using the saved.

Reported-by: Ding Tianhong <dingtianhong@huawei.com>
Fixes: aeea64a ("bonding: don't trust arp requests unless active slave really works")
CC: Jay Vosburgh <fubar@us.ibm.com>
CC: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Acked-by: Ding Tianhong <dingtianhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Veaceslav Falico 2014-02-20 12:07:57 +01:00 • committed by David S. Miller

parent a1eabb0178

commit 010d3c3989

1 changed files with 7 additions and 3 deletions

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drivers/net/bonding/bond_main.c

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