tg3: Fix race condition in tg3_get_stats64().

[mirror_ubuntu-bionic-kernel.git] / drivers / net / ethernet / broadcom / tg3.c

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 185e9e047aa9adda61ac602caea5f59c3efe2d7e..ae42de4fdddf6b77d2c2cf1606795e139d4b472b 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -8720,11 +8720,14 @@ static void tg3_free_consistent(struct tg3 *tp)
        tg3_mem_rx_release(tp);
        tg3_mem_tx_release(tp);
 
+       /* Protect tg3_get_stats64() from reading freed tp->hw_stats. */
+       tg3_full_lock(tp, 0);
        if (tp->hw_stats) {
                dma_free_coherent(&tp->pdev->dev, sizeof(struct tg3_hw_stats),
                                  tp->hw_stats, tp->stats_mapping);
                tp->hw_stats = NULL;
        }
+       tg3_full_unlock(tp);
 }
 
 /*