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VFIO fixes for v4.8-rc2

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- Fix oopses dereferencing empty data (Alex Williamson)
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Merge tag 'vfio-v4.8-rc2' of git://github.com/awilliam/linux-vfio

Pull VFIO fix from Alex Williamson:
 "Fix oops when dereferencing empty data (Alex Williamson)"

* tag 'vfio-v4.8-rc2' of git://github.com/awilliam/linux-vfio:
  vfio/pci: Fix NULL pointer oops in error interrupt setup handling
This commit is contained in:
Linus Torvalds 2016-08-12 16:34:58 -07:00
commit f31494bd05
1 changed files with 49 additions and 36 deletions
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85
drivers/vfio/pci/vfio_pci_intrs.c
View file

@ -564,67 +564,80 @@ static int vfio_pci_set_msi_trigger(struct vfio_pci_device *vdev,
}
static int vfio_pci_set_ctx_trigger_single(struct eventfd_ctx **ctx,
uint32_t flags, void *data)
unsigned int count, uint32_t flags,
void *data)
{
int32_t fd = *(int32_t *)data;
if (!(flags & VFIO_IRQ_SET_DATA_TYPE_MASK))
return -EINVAL;
/* DATA_NONE/DATA_BOOL enables loopback testing */
if (flags & VFIO_IRQ_SET_DATA_NONE) {
if (*ctx)
eventfd_signal(*ctx, 1);
return 0;
if (*ctx) {
if (count) {
eventfd_signal(*ctx, 1);
} else {
eventfd_ctx_put(*ctx);
*ctx = NULL;
}
return 0;
}
} else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
uint8_t trigger = *(uint8_t *)data;
uint8_t trigger;
if (!count)
return -EINVAL;
trigger = *(uint8_t *)data;
if (trigger && *ctx)
eventfd_signal(*ctx, 1);
return 0;
} else if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
int32_t fd;
if (!count)
return -EINVAL;
fd = *(int32_t *)data;
if (fd == -1) {
if (*ctx)
eventfd_ctx_put(*ctx);
*ctx = NULL;
} else if (fd >= 0) {
struct eventfd_ctx *efdctx;
efdctx = eventfd_ctx_fdget(fd);
if (IS_ERR(efdctx))
return PTR_ERR(efdctx);
if (*ctx)
eventfd_ctx_put(*ctx);
*ctx = efdctx;
}
return 0;
}
/* Handle SET_DATA_EVENTFD */
if (fd == -1) {
if (*ctx)
eventfd_ctx_put(*ctx);
*ctx = NULL;
return 0;
} else if (fd >= 0) {
struct eventfd_ctx *efdctx;
efdctx = eventfd_ctx_fdget(fd);
if (IS_ERR(efdctx))
return PTR_ERR(efdctx);
if (*ctx)
eventfd_ctx_put(*ctx);
*ctx = efdctx;
return 0;
} else
return -EINVAL;
return -EINVAL;
}
static int vfio_pci_set_err_trigger(struct vfio_pci_device *vdev,
unsigned index, unsigned start,
unsigned count, uint32_t flags, void *data)
{
if (index != VFIO_PCI_ERR_IRQ_INDEX)
if (index != VFIO_PCI_ERR_IRQ_INDEX || start != 0 || count > 1)
return -EINVAL;
/*
* We should sanitize start & count, but that wasn't caught
* originally, so this IRQ index must forever ignore them :-(
*/
return vfio_pci_set_ctx_trigger_single(&vdev->err_trigger, flags, data);
return vfio_pci_set_ctx_trigger_single(&vdev->err_trigger,
count, flags, data);
}
static int vfio_pci_set_req_trigger(struct vfio_pci_device *vdev,
unsigned index, unsigned start,
unsigned count, uint32_t flags, void *data)
{
if (index != VFIO_PCI_REQ_IRQ_INDEX || start != 0 || count != 1)
if (index != VFIO_PCI_REQ_IRQ_INDEX || start != 0 || count > 1)
return -EINVAL;
return vfio_pci_set_ctx_trigger_single(&vdev->req_trigger, flags, data);
return vfio_pci_set_ctx_trigger_single(&vdev->req_trigger,
count, flags, data);
}
int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags,