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From cb06d102327eadcd1bdc480bfd9f8876251d1007 Mon Sep 17 00:00:00 2001
From: Christoph Paasch <christoph.paasch@uclouvain.be>
Date: Fri, 21 Mar 2014 03:48:19 -0700
Subject: [PATCH] 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@intel.com>
Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
drivers/net/ethernet/intel/igb/igb_main.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -1034,6 +1034,12 @@ static void igb_reset_q_vector(struct ig
if (!q_vector)
return;
+ /* 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;
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