From 6449e31ddebdce68508cfaf0915d31aad3835f4f Mon Sep 17 00:00:00 2001 From: Alexey Khoroshilov Date: Sun, 25 Sep 2016 00:19:05 +0300 Subject: [PATCH] firewire: nosy: do not ignore errors in ioremap_nocache() There is no check if ioremap_nocache() returns a valid pointer. Potentially it can lead to null pointer dereference. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov Signed-off-by: Stefan Richter (renamed goto labels) --- drivers/firewire/nosy.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/firewire/nosy.c b/drivers/firewire/nosy.c index 631c977b0da5..180f0a96528c 100644 --- a/drivers/firewire/nosy.c +++ b/drivers/firewire/nosy.c @@ -566,6 +566,11 @@ add_card(struct pci_dev *dev, const struct pci_device_id *unused) lynx->registers = ioremap_nocache(pci_resource_start(dev, 0), PCILYNX_MAX_REGISTER); + if (lynx->registers == NULL) { + dev_err(&dev->dev, "Failed to map registers\n"); + ret = -ENOMEM; + goto fail_deallocate_lynx; + } lynx->rcv_start_pcl = pci_alloc_consistent(lynx->pci_device, sizeof(struct pcl), &lynx->rcv_start_pcl_bus); @@ -578,7 +583,7 @@ add_card(struct pci_dev *dev, const struct pci_device_id *unused) lynx->rcv_buffer == NULL) { dev_err(&dev->dev, "Failed to allocate receive buffer\n"); ret = -ENOMEM; - goto fail_deallocate; + goto fail_deallocate_buffers; } lynx->rcv_start_pcl->next = cpu_to_le32(lynx->rcv_pcl_bus); lynx->rcv_pcl->next = cpu_to_le32(PCL_NEXT_INVALID); @@ -641,7 +646,7 @@ add_card(struct pci_dev *dev, const struct pci_device_id *unused) dev_err(&dev->dev, "Failed to allocate shared interrupt %d\n", dev->irq); ret = -EIO; - goto fail_deallocate; + goto fail_deallocate_buffers; } lynx->misc.parent = &dev->dev; @@ -668,7 +673,7 @@ fail_free_irq: reg_write(lynx, PCI_INT_ENABLE, 0); free_irq(lynx->pci_device->irq, lynx); -fail_deallocate: +fail_deallocate_buffers: if (lynx->rcv_start_pcl) pci_free_consistent(lynx->pci_device, sizeof(struct pcl), lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus); @@ -679,6 +684,8 @@ fail_deallocate: pci_free_consistent(lynx->pci_device, PAGE_SIZE, lynx->rcv_buffer, lynx->rcv_buffer_bus); iounmap(lynx->registers); + +fail_deallocate_lynx: kfree(lynx); fail_disable: