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Date: Tue, 18 Feb 2014 14:06:57 +0100 From: Christoph Paasch <christoph.paasch@...ouvain.be> To: netdev@...r.kernel.org, e1000-devel@...ts.sourceforge.net Cc: David Miller <davem@...emloft.net>, Jeff Kirsher <jeffrey.t.kirsher@...el.com>, Jesse Brandeburg <jesse.brandeburg@...el.com>, Carolyn Wyborny <carolyn.wyborny@...el.com> Subject: [PATCH net] 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 <carolyn.wyborny@...el.com> Signed-off-by: Christoph Paasch <christoph.paasch@...ouvain.be> --- drivers/net/ethernet/intel/igb/igb_main.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 46d31a49f5ea..bfcf192ee87d 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -1014,6 +1014,12 @@ 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; -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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