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ixgbe: fix panic when using macvlan with l2-fwd-offload enabled

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Fix NULL pointer dereference in the case where a macvlan interface is
brought up while the PF is still down:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
IP: [<ffffffffa0170fb2>] ixgbe_alloc_rx_buffers+0x42/0x1a0 [ixgbe]

Call Trace:
[<ffffffffa017336b>] ixgbe_configure_rx_ring+0x2eb/0x3d0 [ixgbe]
[<ffffffffa0173811>] ixgbe_fwd_ring_up+0xd1/0x380 [ixgbe]
[<ffffffffa0179709>] ixgbe_fwd_add+0x149/0x230 [ixgbe]
[<ffffffffa0113480>] macvlan_open+0x260/0x2b0 [macvlan]

Reported-by: Matthew Garrett <mjg59@coreos.com>
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Emil Tantilov 2016-09-22 15:06:52 -07:00 committed by Jeff Kirsher
parent d5d32e4b76
commit a3b8cb1f84
1 changed files with 8 additions and 4 deletions
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4
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
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@ -9135,10 +9135,14 @@ static void *ixgbe_fwd_add(struct net_device *pdev, struct net_device *vdev)
goto fwd_add_err;
fwd_adapter->pool = pool;
fwd_adapter->real_adapter = adapter;
if (netif_running(pdev)) {
err = ixgbe_fwd_ring_up(vdev, fwd_adapter);
if (err)
goto fwd_add_err;
netif_tx_start_all_queues(vdev);
}
return fwd_adapter;
fwd_add_err:
/* unwind counter and free adapter struct */