From: Christoph Paasch Date: Fri, 21 Mar 2014 10:48:19 +0000 (-0700) Subject: igb: Fix Null-pointer dereference in igb_reset_q_vector X-Git-Tag: v3.15-rc1~113^2~97^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=cb06d102327eadcd1bdc480bfd9f8876251d1007;p=platform%2Fkernel%2Flinux-exynos.git igb: Fix Null-pointer dereference in igb_reset_q_vector When igb_set_interrupt_capability() calls igb_reset_interrupt_capability() (e.g., because CONFIG_PCI_MSI is unset), num_q_vectors has been set but no vector has yet been allocated. igb_reset_interrupt_capability() will then call igb_reset_q_vector, which assumes that the vector is allocated. As this is not the case, we are accessing a NULL-pointer. This patch fixes it by checking that q_vector is indeed different from NULL. Fixes: 02ef6e1d0b0023 (igb: Fix queue allocation method to accommodate changing during runtime) Cc: Carolyn Wyborny Signed-off-by: Christoph Paasch Tested-by: Jeff Pieper Signed-off-by: Jeff Kirsher --- diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index e8b4f7b..6acf787 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -1035,6 +1035,12 @@ static void igb_reset_q_vector(struct igb_adapter *adapter, int v_idx) { struct igb_q_vector *q_vector = adapter->q_vector[v_idx]; + /* Coming from igb_set_interrupt_capability, the vectors are not yet + * allocated. So, q_vector is NULL so we should stop here. + */ + if (!q_vector) + return; + if (q_vector->tx.ring) adapter->tx_ring[q_vector->tx.ring->queue_index] = NULL;