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Date: Mon, 3 Aug 2015 09:36:26 +0800 From: Jia-Ju Bai <baijiaju1990@....com> To: jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@....com> Subject: [PATCH]Fix a null dereference in e1000_open When e1000e_setup_rx_resources is failed in e1000_open, e1000e_free_tx_resources in "err_setup_rx" segment is executed. "writel(0, tx_ring->head)" statement in e1000_clean_tx_ring in e1000e_free_tx_resources will cause a null dereference(crash), because "tx_ring->head" is only assigned in e1000_configure_tx in e1000_configure, but it is after e1000e_setup_rx_resources. This patch adds a check to fix it. Signed-off-by: Jia-Ju Bai <baijiaju1990@....com> --- drivers/net/ethernet/intel/e1000e/netdev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index 89d788d..838ec8e 100644 --- a/drivers/net/ethernet/intel/e1000e/netdev.c +++ b/drivers/net/ethernet/intel/e1000e/netdev.c @@ -2448,7 +2448,8 @@ static void e1000_clean_tx_ring(struct e1000_ring *tx_ring) tx_ring->next_to_use = 0; tx_ring->next_to_clean = 0; - writel(0, tx_ring->head); + if (tx_ring->head) + writel(0, tx_ring->head); if (adapter->flags2 & FLAG2_PCIM2PCI_ARBITER_WA) e1000e_update_tdt_wa(tx_ring, 0); else -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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