iavf: prevent accidental free of filter structure

[ Upstream commit 4f0400803818f2642f066d3eacaf013f23554cc7 ]

In iavf_config_clsflower, the filter structure could be accidentally
released at the end, if iavf_parse_cls_flower or iavf_handle_tclass ever
return a non-zero but positive value.

In this case, the function continues through to the end, and will call
kfree() on the filter structure even though it has been added to the
linked list.

This can actually happen because iavf_parse_cls_flower will return
a positive IAVF_ERR_CONFIG value instead of the traditional negative
error codes.

Fix this by ensuring that the kfree() check and error checks are
similar. Use the more idiomatic "if (err)" to catch all non-zero error
codes.

Fixes: 0075fa0fadd0 ("i40evf: Add support to apply cloud filters")
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Tony Brelinski <tony.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/intel/iavf/iavf_main.c b/drivers/net/ethernet/intel/iavf/iavf_main.c
index b0fe5aafd1b269427bf646bca95bcb40a724ea1a..90a9379b4e467035acaf7f308a09604f3e4409ca 100644 (file)
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -3027,11 +3027,11 @@ static int iavf_configure_clsflower(struct iavf_adapter *adapter,
        /* start out with flow type and eth type IPv4 to begin with */
        filter->f.flow_type = VIRTCHNL_TCP_V4_FLOW;
        err = iavf_parse_cls_flower(adapter, cls_flower, filter);
-       if (err < 0)
+       if (err)
                goto err;
 
        err = iavf_handle_tclass(adapter, tc, filter);
-       if (err < 0)
+       if (err)
                goto err;
 
        /* add filter to the list */