linux-kernel - [PATCH AUTOSEL 3.18 93/98] igb: fix NULL derefs due to skipped SR-IOV enabling

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Message-Id: <20181025141853.214051-93-sashal@kernel.org>
Date:   Thu, 25 Oct 2018 10:18:48 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jan Beulich <JBeulich@...e.com>, Jan Beulich <jbeulich@...e.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 3.18 93/98] igb: fix NULL derefs due to skipped SR-IOV enabling

From: Jan Beulich <JBeulich@...e.com>

[ Upstream commit be06998f96ecb93938ad2cce46c4289bf7cf45bc ]

The combined effect of commits 6423fc3416 ("igb: do not re-init SR-IOV
during probe") and ceee3450b3 ("igb: make sure SR-IOV init uses the
right number of queues") causes VFs no longer getting set up, leading
to NULL pointer dereferences due to the adapter's ->vf_data being NULL
while ->vfs_allocated_count is non-zero. The first commit not only
neglected the side effect of igb_sriov_reinit() that the second commit
tried to account for, but also that of setting IGB_FLAG_HAS_MSIX,
without which igb_enable_sriov() is effectively a no-op. Calling
igb_{,re}set_interrupt_capability() as done here seems to address this,
but I'm not sure whether this is better than sinply reverting the other
two commits.

Signed-off-by: Jan Beulich <jbeulich@...e.com>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 84049078c4f0..b73c896ed184 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -2866,6 +2866,13 @@ static void igb_probe_vfs(struct igb_adapter *adapter)
 	if ((hw->mac.type == e1000_i210) || (hw->mac.type == e1000_i211))
 		return;

+	/* Of the below we really only want the effect of getting
+	 * IGB_FLAG_HAS_MSIX set (if available), without which
+	 * igb_enable_sriov() has no effect.
+	 */
+	igb_set_interrupt_capability(adapter, true);
+	igb_reset_interrupt_capability(adapter);
+
 	pci_sriov_set_totalvfs(pdev, 7);
 	igb_enable_sriov(pdev, max_vfs);

-- 
2.17.1