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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
- @@ -1032,6 +1032,12 @@ 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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