i40e: Memory leak in i40e_config_iwarp_qvlist

[ Upstream commit 0b636446 ]

Added freeing the old allocation of vf->qvlist_info in function
i40e_config_iwarp_qvlist before overwriting it with
the new allocation.

Fixes: e3219ce6 ("i40e: Add support for client interface for IWARP driver")
Signed-off-by: Martyna Szapar <martyna.szapar@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c

@@ -441,6 +441,7 @@ static int i40e_config_iwarp_qvlist(struct i40e_vf *vf,
 	u32 v_idx, i, reg_idx, reg;
 	u32 next_q_idx, next_q_type;
 	u32 msix_vf, size;
+	int ret = 0;
 
 	msix_vf = pf->hw.func_caps.num_msix_vectors_vf;
 
@@ -449,16 +450,19 @@ static int i40e_config_iwarp_qvlist(struct i40e_vf *vf,
 			 "Incorrect number of iwarp vectors %u. Maximum %u allowed.\n",
 			 qvlist_info->num_vectors,
 			 msix_vf);
-		goto err;
+		ret = -EINVAL;
+		goto err_out;
 	}
 
 	size = sizeof(struct virtchnl_iwarp_qvlist_info) +
 	       (sizeof(struct virtchnl_iwarp_qv_info) *
 						(qvlist_info->num_vectors - 1));
+	kfree(vf->qvlist_info);
 	vf->qvlist_info = kzalloc(size, GFP_KERNEL);
-	if (!vf->qvlist_info)
-		return -ENOMEM;
-
+	if (!vf->qvlist_info) {
+		ret = -ENOMEM;
+		goto err_out;
+	}
 	vf->qvlist_info->num_vectors = qvlist_info->num_vectors;
 
 	msix_vf = pf->hw.func_caps.num_msix_vectors_vf;
@@ -469,8 +473,10 @@ static int i40e_config_iwarp_qvlist(struct i40e_vf *vf,
 		v_idx = qv_info->v_idx;
 
 		/* Validate vector id belongs to this vf */
-		if (!i40e_vc_isvalid_vector_id(vf, v_idx))
-			goto err;
+		if (!i40e_vc_isvalid_vector_id(vf, v_idx)) {
+			ret = -EINVAL;
+			goto err_free;
+		}
 
 		vf->qvlist_info->qv_info[i] = *qv_info;
 
@@ -512,10 +518,11 @@ static int i40e_config_iwarp_qvlist(struct i40e_vf *vf,
 	}
 
 	return 0;
-err:
+err_free:
 	kfree(vf->qvlist_info);
 	vf->qvlist_info = NULL;
-	return -EINVAL;
+err_out:
+	return ret;
 }
 
 /**