bnxt_en: Improve RX consumer index validity check.

[ Upstream commit a1b0e4e684e9c300b9e759b46cb7a0147e61ddff ]

There is logic to check that the RX/TPA consumer index is the expected
index to work around a hardware problem.  However, the potentially bad
consumer index is first used to index into an array to reference an entry.
This can potentially crash if the bad consumer index is beyond legal
range.  Improve the logic to use the consumer index for dereferencing
after the validity check and log an error message.

Fixes: fa7e28127a5a ("bnxt_en: Add workaround to detect bad opaque in rx completion (part 2)")
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index b0f20226042a8ef702a4dbcf219b2426cc27b2c9..45ea2718c65d45a412eb4b44a03401db097f59a0 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -959,6 +959,8 @@ static void bnxt_tpa_start(struct bnxt *bp, struct bnxt_rx_ring_info *rxr,
        tpa_info = &rxr->rx_tpa[agg_id];
 
        if (unlikely(cons != rxr->rx_next_cons)) {
+               netdev_warn(bp->dev, "TPA cons %x != expected cons %x\n",
+                           cons, rxr->rx_next_cons);
                bnxt_sched_reset(bp, rxr);
                return;
        }
@@ -1377,14 +1379,16 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_napi *bnapi, u32 *raw_cons,
        }
 
        cons = rxcmp->rx_cmp_opaque;
-       rx_buf = &rxr->rx_buf_ring[cons];
-       data = rx_buf->data;
        if (unlikely(cons != rxr->rx_next_cons)) {
                int rc1 = bnxt_discard_rx(bp, bnapi, raw_cons, rxcmp);
 
+               netdev_warn(bp->dev, "RX cons %x != expected cons %x\n",
+                           cons, rxr->rx_next_cons);
                bnxt_sched_reset(bp, rxr);
                return rc1;
        }
+       rx_buf = &rxr->rx_buf_ring[cons];
+       data = rx_buf->data;
        prefetch(data);
 
        agg_bufs = (le32_to_cpu(rxcmp->rx_cmp_misc_v1) & RX_CMP_AGG_BUFS) >>