Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.14 11/25] e1000: check on netif_running() before calling e1000_up() | Date | Thu, 20 Sep 2018 02:48:22 +0000 |
| |
From: Bo Chen <chenbo@pdx.edu>
[ Upstream commit cf1acec008f8d7761aa3fd7c4bca7e17b2d2512d ]
When the device is not up, the call to 'e1000_up()' from the error handling path of 'e1000_set_ringparam()' causes a kernel oops with a null-pointer dereference. The null-pointer dereference is triggered in function 'e1000_alloc_rx_buffers()' at line 'buffer_info = &rx_ring->buffer_info[i]'.
This bug was reported by COD, a tool for testing kernel module binaries I am building. This bug was also detected by KFI from Dr. Kai Cong.
This patch fixes the bug by checking on 'netif_running()' before calling 'e1000_up()' in 'e1000_set_ringparam()'.
Signed-off-by: Bo Chen <chenbo@pdx.edu> Acked-by: Alexander Duyck <alexander.h.duyck@intel.com> Tested-by: Aaron Brown <aaron.f.brown@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> --- drivers/net/ethernet/intel/e1000/e1000_ethtool.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/e1000/e1000_ethtool.c b/drivers/net/ethernet/intel/e1000/e1000_ethtool.c index 3b3983a1ffbb..d44d3643677d 100644 --- a/drivers/net/ethernet/intel/e1000/e1000_ethtool.c +++ b/drivers/net/ethernet/intel/e1000/e1000_ethtool.c @@ -664,7 +664,8 @@ static int e1000_set_ringparam(struct net_device *netdev, err_alloc_rx: kfree(txdr); err_alloc_tx: - e1000_up(adapter); + if (netif_running(adapter->netdev)) + e1000_up(adapter); err_setup: clear_bit(__E1000_RESETTING, &adapter->flags); return err; -- 2.17.1
| |