This is a note to let you know that I've just added the patch titled
igb: Fix Null-pointer dereference in igb_reset_q_vector
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
igb-fix-null-pointer-dereference-in-igb_reset_q_vector.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From cb06d102327eadcd1bdc480bfd9f8876251d1007 Mon Sep 17 00:00:00 2001
From: Christoph Paasch <christoph.paasch@xxxxxxxxxxxx>
Date: Fri, 21 Mar 2014 03:48:19 -0700
Subject: igb: Fix Null-pointer dereference in igb_reset_q_vector
From: Christoph Paasch <christoph.paasch@xxxxxxxxxxxx>
commit cb06d102327eadcd1bdc480bfd9f8876251d1007 upstream.
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@xxxxxxxxx>
Signed-off-by: Christoph Paasch <christoph.paasch@xxxxxxxxxxxx>
Tested-by: Jeff Pieper <jeffrey.e.pieper@xxxxxxxxx>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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
@@ -1014,6 +1014,12 @@ static void igb_reset_q_vector(struct ig
{
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;
Patches currently in stable-queue which might be from christoph.paasch@xxxxxxxxxxxx are
queue-3.14/igb-fix-null-pointer-dereference-in-igb_reset_q_vector.patch
queue-3.14/igb-unset-igb_flag_has_msix-flag-when-falling-back-to-msi-only.patch
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