From: Alan Brady Date: Tue, 8 Nov 2016 21:05:05 +0000 (-0800) Subject: i40evf: check for msix_entries null dereference X-Git-Tag: v5.15~12359^2~94^2~7 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=47d2a5d8279dcdcaec2c67b3d2c72cfa62979c58;p=mirror_ubuntu-kernels.git i40evf: check for msix_entries null dereference It is possible for msix_entries to be freed by a previous suspend/remove before a VF is closed. This patch fixes the issue by checking for NULL before dereferencing msix_entries and returning early in the case where it is NULL within the i40evf_close code path. Without this patch it is possible to trigger a kernel panic through NULL dereference. Change-ID: I92a2746e82533a889e25f91578eac9abd0388ae2 Signed-off-by: Alan Brady Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c index f04ac36f25cf..420e5453effe 100644 --- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c +++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c @@ -631,6 +631,9 @@ static void i40evf_free_traffic_irqs(struct i40evf_adapter *adapter) { int vector, irq_num, q_vectors; + if (!adapter->msix_entries) + return; + q_vectors = adapter->num_msix_vectors - NONQ_VECS; for (vector = 0; vector < q_vectors; vector++) { @@ -1443,6 +1446,9 @@ static void i40evf_free_q_vectors(struct i40evf_adapter *adapter) **/ void i40evf_reset_interrupt_capability(struct i40evf_adapter *adapter) { + if (!adapter->msix_entries) + return; + pci_disable_msix(adapter->pdev); kfree(adapter->msix_entries); adapter->msix_entries = NULL;