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Date: Fri, 30 Dec 2011 14:40:23 -0800 From: Stephen Hemminger <shemminger@...tta.com> To: David Miller <davem@...emloft.net>, Jay Vosburgh <fubar@...ibm.com>, Andy Gospodarek <andy@...yhouse.net>, netdev@...r.kernel.org Subject: [PATCH] bonding: fix error handling if slave is busy The bonding device can cause kernel panic in the enslave error handling. If slave device already has a receive handler registered, then the error unwind does not clear the new entry out of the slave list. This ends up leaving a reference to freed memory in the bond device slave linked list. The following is a simple example: # modprobe dummy # ip li add dummy0-1 link dummy0 type macvlan # modprobe bonding # echo +dummy0 >/sys/class/net/bond0/bonding/slaves # ip -s li show dev bond0 This returns with -EBUSY, but the bonding device has bogus entry in the slave list, and will panic on next operation that gets statistics from bond0. The fix is to detach the slave (which removes it from the list) in the unwind path. Signed-off-by: Stephen Hemminger <shemminger@...tta.com> --- Patch is against net-next but should be applied to net (3.2), and stable (3.1 and 3.0). --- a/drivers/net/bonding/bond_main.c 2011-12-30 14:20:03.171823181 -0800 +++ b/drivers/net/bonding/bond_main.c 2011-12-30 14:20:20.232020474 -0800 @@ -1853,6 +1853,9 @@ err_dest_symlinks: bond_destroy_slave_symlinks(bond_dev, slave_dev); err_close: + write_lock_bh(&bond->lock); + bond_detach_slave(bond, new_slave); + write_unlock_bh(&bond->lock); dev_close(slave_dev); err_unset_master: -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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