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| author |   Jacob Keller <jacob.e.keller@intel.com> | 2017-02-06 14:38:40 -0800 |
|---|---|---|
| committer |   Jeff Kirsher <jeffrey.t.kirsher@intel.com> | 2017-03-20 16:45:20 -0700 |
| commit | 01016da1e58136518252822738fe833c662df916 (patch) | |
| tree | be934c6cdc15dffbadf626dfbb13968d041bbdb9 | |
| parent | i40e: don't use arrays for (src|dst)_ip (diff) | |
| download | linux-dev-01016da1e58136518252822738fe833c662df916.tar.xz linux-dev-01016da1e58136518252822738fe833c662df916.zip | |
i40e: rework exit flow of i40e_add_fdir_ethtool
Refactor the exit flow of the i40e_add_fdir_ethtool function. Move the
input_label to the end of the function, removing the dependency on
having a non-zero return value. Add a comment explaining why it is ok
not to free the fdir data structure, because the structure is now stored
in the fdir_filter_list.
Change-Id: I723342181d59cd0c9f3b31140c37961ba37bb242
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
| -rw-r--r-- | drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c index 7a22b473dbdd..d16a5a6b24fc 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c +++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c @@ -2828,12 +2828,19 @@ static int i40e_add_fdir_ethtool(struct i40e_vsi *vsi, } ret = i40e_add_del_fdir(vsi, input, true); -free_input: if (ret) - kfree(input); - else - i40e_update_ethtool_fdir_entry(vsi, input, fsp->location, NULL); + goto free_input; + + /* Add the input filter to the fdir_input_list, possibly replacing + * a previous filter. Do not free the input structure after adding it + * to the list as this would cause a use-after-free bug. + */ + i40e_update_ethtool_fdir_entry(vsi, input, fsp->location, NULL); + return 0; + +free_input: + kfree(input); return ret; } |