[PATCH net 3/6] bnxt_en: Fix possible crash in bnxt_hwrm_ring_free() under error conditions.

[Michael Chan]

If we encounter errors during open and proceed to clean up,
bnxt_hwrm_ring_free() may crash if the rings we try to free have never
been allocated.  bnxt_cp_ring_for_rx() or bnxt_cp_ring_for_tx()
may reference pointers that have not been allocated.

Fix it by checking for valid fw_ring_id first before calling
bnxt_cp_ring_for_rx() or bnxt_cp_ring_for_tx().

Fixes: 2c61d2117ecb ("bnxt_en: Add helper functions to get firmware CP ring 
ID.")
Signed-off-by: Michael Chan <michael.c...@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c 
b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 5d02f59..b03669f 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -5135,10 +5135,10 @@ static void bnxt_hwrm_ring_free(struct bnxt *bp, bool 
close_path)
        for (i = 0; i < bp->tx_nr_rings; i++) {
                struct bnxt_tx_ring_info *txr = &bp->tx_ring[i];
                struct bnxt_ring_struct *ring = &txr->tx_ring_struct;
-               u32 cmpl_ring_id;
 
-               cmpl_ring_id = bnxt_cp_ring_for_tx(bp, txr);
                if (ring->fw_ring_id != INVALID_HW_RING_ID) {
+                       u32 cmpl_ring_id = bnxt_cp_ring_for_tx(bp, txr);
+
                        hwrm_ring_free_send_msg(bp, ring,
                                                RING_FREE_REQ_RING_TYPE_TX,
                                                close_path ? cmpl_ring_id :
@@ -5151,10 +5151,10 @@ static void bnxt_hwrm_ring_free(struct bnxt *bp, bool 
close_path)
                struct bnxt_rx_ring_info *rxr = &bp->rx_ring[i];
                struct bnxt_ring_struct *ring = &rxr->rx_ring_struct;
                u32 grp_idx = rxr->bnapi->index;
-               u32 cmpl_ring_id;
 
-               cmpl_ring_id = bnxt_cp_ring_for_rx(bp, rxr);
                if (ring->fw_ring_id != INVALID_HW_RING_ID) {
+                       u32 cmpl_ring_id = bnxt_cp_ring_for_rx(bp, rxr);
+
                        hwrm_ring_free_send_msg(bp, ring,
                                                RING_FREE_REQ_RING_TYPE_RX,
                                                close_path ? cmpl_ring_id :
@@ -5173,10 +5173,10 @@ static void bnxt_hwrm_ring_free(struct bnxt *bp, bool 
close_path)
                struct bnxt_rx_ring_info *rxr = &bp->rx_ring[i];
                struct bnxt_ring_struct *ring = &rxr->rx_agg_ring_struct;
                u32 grp_idx = rxr->bnapi->index;
-               u32 cmpl_ring_id;
 
-               cmpl_ring_id = bnxt_cp_ring_for_rx(bp, rxr);
                if (ring->fw_ring_id != INVALID_HW_RING_ID) {
+                       u32 cmpl_ring_id = bnxt_cp_ring_for_rx(bp, rxr);
+
                        hwrm_ring_free_send_msg(bp, ring, type,
                                                close_path ? cmpl_ring_id :
                                                INVALID_HW_RING_ID);
-- 
2.5.1