Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.16 28/52] IB/hfi1: Fix NULL pointer dereference when invalid num_vls is used | Date | Tue, 8 May 2018 10:10:26 +0200 |
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4.16-stable review patch. If anyone has any objections, please let me know.
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From: Sebastian Sanchez <sebastian.sanchez@intel.com>
commit 45d924571a5e1329580811f2419da61b07ac3613 upstream.
When an invalid num_vls is used as a module parameter, the code execution follows an exception path where the macro dd_dev_err() expects dd->pcidev->dev not to be NULL in hfi1_init_dd(). This causes a NULL pointer dereference.
Fix hfi1_init_dd() by initializing dd->pcidev and dd->pcidev->dev earlier in the code. If a dd exists, then dd->pcidev and dd->pcidev->dev always exists.
BUG: unable to handle kernel NULL pointer dereference at 00000000000000f0 IP: __dev_printk+0x15/0x90 Workqueue: events work_for_cpu_fn RIP: 0010:__dev_printk+0x15/0x90 Call Trace: dev_err+0x6c/0x90 ? hfi1_init_pportdata+0x38d/0x3f0 [hfi1] hfi1_init_dd+0xdd/0x2530 [hfi1] ? pci_conf1_read+0xb2/0xf0 ? pci_read_config_word.part.9+0x64/0x80 ? pci_conf1_write+0xb0/0xf0 ? pcie_capability_clear_and_set_word+0x57/0x80 init_one+0x141/0x490 [hfi1] local_pci_probe+0x3f/0xa0 work_for_cpu_fn+0x10/0x20 process_one_work+0x152/0x350 worker_thread+0x1cf/0x3e0 kthread+0xf5/0x130 ? max_active_store+0x80/0x80 ? kthread_bind+0x10/0x10 ? do_syscall_64+0x6e/0x1a0 ? SyS_exit_group+0x10/0x10 ret_from_fork+0x35/0x40
Cc: <stable@vger.kernel.org> # 4.9.x Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com> Signed-off-by: Sebastian Sanchez <sebastian.sanchez@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/infiniband/hw/hfi1/init.c | 2 ++ drivers/infiniband/hw/hfi1/pcie.c | 3 --- 2 files changed, 2 insertions(+), 3 deletions(-)
--- a/drivers/infiniband/hw/hfi1/init.c +++ b/drivers/infiniband/hw/hfi1/init.c @@ -1265,6 +1265,8 @@ struct hfi1_devdata *hfi1_alloc_devdata( return ERR_PTR(-ENOMEM); dd->num_pports = nports; dd->pport = (struct hfi1_pportdata *)(dd + 1); + dd->pcidev = pdev; + pci_set_drvdata(pdev, dd); INIT_LIST_HEAD(&dd->list); idr_preload(GFP_KERNEL); --- a/drivers/infiniband/hw/hfi1/pcie.c +++ b/drivers/infiniband/hw/hfi1/pcie.c @@ -163,9 +163,6 @@ int hfi1_pcie_ddinit(struct hfi1_devdata resource_size_t addr; int ret = 0; - dd->pcidev = pdev; - pci_set_drvdata(pdev, dd); - addr = pci_resource_start(pdev, 0); len = pci_resource_len(pdev, 0);
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