bnxt_en: Fix uninitialized variable usage in bnxt_rx_pkt().

In bnxt_rx_pkt(), if the driver encounters BD errors, it will recycle
the buffers and jump to the end where the uninitailized variable "len"
is referenced.  Fix it by adding a new jump label that will skip
the length update.  This is the most correct fix since the length
may not be valid when we get this type of error.

Fixes: 6a8788f25625 ("bnxt_en: add support for software dynamic interrupt moderation")
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index b6cb7b8..52ade13 100644 (file)
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -1625,7 +1625,7 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
                        netdev_warn(bp->dev, "RX buffer error %x\n", rx_err);
                        bnxt_sched_reset(bp, rxr);
                }
-               goto next_rx;
+               goto next_rx_no_len;
        }
 
        len = le32_to_cpu(rxcmp->rx_cmp_len_flags_type) >> RX_CMP_LEN_SHIFT;
@@ -1706,12 +1706,13 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr,
        rc = 1;
 
 next_rx:
-       rxr->rx_prod = NEXT_RX(prod);
-       rxr->rx_next_cons = NEXT_RX(cons);
-
        cpr->rx_packets += 1;
        cpr->rx_bytes += len;
 
+next_rx_no_len:
+       rxr->rx_prod = NEXT_RX(prod);
+       rxr->rx_next_cons = NEXT_RX(cons);
+
 next_rx_no_prod_no_len:
        *raw_cons = tmp_raw_cons;