From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bimmy Pujari Date: Tue, 8 Nov 2016 13:05:05 -0800 Subject: [Intel-wired-lan] [next PATCH S52-V2 01/15] i40evf: check for msix_entries null dereference In-Reply-To: <1478639119-14656-1-git-send-email-bimmy.pujari@intel.com> References: <1478639119-14656-1-git-send-email-bimmy.pujari@intel.com> Message-ID: <1478639119-14656-2-git-send-email-bimmy.pujari@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: intel-wired-lan@osuosl.org List-ID: From: Alan Brady 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. Signed-off-by: Alan Brady Change-ID: I92a2746e82533a889e25f91578eac9abd0388ae2 --- Testing-hints: Create lots of VFs and bring themm up on the host, assign them and the PF to namespaces, then shut the system down. drivers/net/ethernet/intel/i40evf/i40evf_main.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c index f04ac36..420e545 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; -- 2.4.11