From: Michael Chan Date: Fri, 6 Jan 2017 21:18:53 +0000 (-0500) Subject: tg3: Fix race condition in tg3_get_stats64(). X-Git-Tag: v4.13~1543^2~3 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=f5992b72ebe0dde488fa8f706b887194020c66fc;p=mirror_ubuntu-bionic-kernel.git tg3: Fix race condition in tg3_get_stats64(). The driver's ndo_get_stats64() method is not always called under RTNL. So it can race with driver close or ethtool reconfigurations. Fix the race condition by taking tp->lock spinlock in tg3_free_consistent() when freeing the tp->hw_stats memory block. tg3_get_stats64() is already taking tp->lock. Reported-by: Wang Yufen Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c index 185e9e047aa9..ae42de4fdddf 100644 --- 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); } /*