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VFIO fix for v6.10

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- Recent stable backports are exposing a bug introduced in the v6.10
    development cycle where a counter value is uninitialized.  This leads
    to regressions in userspace drivers like QEMU where where the kernel
    might ask for an arbitrary buffer size or return out of memory itself
    based on a bogus value.  Zero initialize the counter.  (Yi Liu)
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Merge tag 'vfio-v6.10' of https://github.com/awilliam/linux-vfio

Pull VFIO fix from Alex Williamson:

 - Recent stable backports are exposing a bug introduced in the v6.10
   development cycle where a counter value is uninitialized.  This leads
   to regressions in userspace drivers like QEMU where where the kernel
   might ask for an arbitrary buffer size or return out of memory itself
   based on a bogus value.  Zero initialize the counter.  (Yi Liu)

* tag 'vfio-v6.10' of https://github.com/awilliam/linux-vfio:
  vfio/pci: Init the count variable in collecting hot-reset devices
This commit is contained in:
Linus Torvalds 2024-07-10 12:00:43 -07:00
commit d6e1712b78
1 changed files with 1 additions and 1 deletions
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2
drivers/vfio/pci/vfio_pci_core.c
View file

@ -1260,7 +1260,7 @@ static int vfio_pci_ioctl_get_pci_hot_reset_info(
struct vfio_pci_hot_reset_info hdr;
struct vfio_pci_fill_info fill = {};
bool slot = false;
int ret, count;
int ret, count = 0;
if (copy_from_user(&hdr, arg, minsz))
return -EFAULT;