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 44ea67cb3716b0ea64a8c553da6beff3ce136cd3..43c33effd41775ee4b2190c47b9cf244020aec69 100644 (file)
--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -3054,11 +3054,11 @@ 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 */