bnxt_en: make bnxt_free_skbs() safe to call after bnxt_free_mem()

The call to bnxt_free_mem(..., false) in the bnxt_half_open_nic() error
path will deallocate ring descriptor memory via bnxt_free_?x_rings(),
but because irq_re_init is false, the ring info itself is not freed.

To simplify error paths, deallocation functions have generally been
written to be safe when called on unallocated memory. It should always
be safe to call dev_close(), which calls bnxt_free_skbs() a second time,
even in this semi- allocated ring state.

Calling bnxt_free_skbs() a second time with the rings already freed will
cause NULL pointer dereference.  Fix it by checking the rings are valid
before proceeding in bnxt_free_tx_skbs() and
bnxt_free_one_rx_ring_skbs().

Fixes: 975bc99a ("bnxt_en: Refactor bnxt_free_rx_skbs().")
Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -2729,6 +2729,9 @@ static void bnxt_free_tx_skbs(struct bnxt *bp)
 		struct bnxt_tx_ring_info *txr = &bp->tx_ring[i];
 		int j;
 
+		if (!txr->tx_buf_ring)
+			continue;
+
 		for (j = 0; j < max_idx;) {
 			struct bnxt_sw_tx_bd *tx_buf = &txr->tx_buf_ring[j];
 			struct sk_buff *skb;
@@ -2813,6 +2816,9 @@ static void bnxt_free_one_rx_ring_skbs(struct bnxt *bp, int ring_nr)
 	}
 
 skip_rx_tpa_free:
+	if (!rxr->rx_buf_ring)
+		goto skip_rx_buf_free;
+
 	for (i = 0; i < max_idx; i++) {
 		struct bnxt_sw_rx_bd *rx_buf = &rxr->rx_buf_ring[i];
 		dma_addr_t mapping = rx_buf->mapping;
@@ -2835,6 +2841,11 @@ static void bnxt_free_one_rx_ring_skbs(struct bnxt *bp, int ring_nr)
 			kfree(data);
 		}
 	}
+
+skip_rx_buf_free:
+	if (!rxr->rx_agg_ring)
+		goto skip_rx_agg_free;
+
 	for (i = 0; i < max_agg_idx; i++) {
 		struct bnxt_sw_rx_agg_bd *rx_agg_buf = &rxr->rx_agg_ring[i];
 		struct page *page = rx_agg_buf->page;
@@ -2851,6 +2862,8 @@ static void bnxt_free_one_rx_ring_skbs(struct bnxt *bp, int ring_nr)
 
 		__free_page(page);
 	}
+
+skip_rx_agg_free:
 	if (rxr->rx_page) {
 		__free_page(rxr->rx_page);
 		rxr->rx_page = NULL;