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vfio/pci: Init the count variable in collecting hot-reset devices

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[ Upstream commit 5a88a3f67e ]

The count variable is used without initialization, it results in mistakes
in the device counting and crashes the userspace if the get hot reset info
path is triggered.

Fixes: f6944d4a0b ("vfio/pci: Collect hot-reset devices to local buffer")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=219010
Reported-by: Žilvinas Žaltiena <zaltys@natrix.lt>
Cc: Beld Zhang <beldzhang@gmail.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20240710004150.319105-1-yi.l.liu@intel.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yi Liu 2024-07-09 17:41:50 -07:00 committed by Greg Kroah-Hartman
parent c3111b3cf3
commit f476dffc52
1 changed files with 1 additions and 1 deletions
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2
drivers/vfio/pci/vfio_pci_core.c
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@ -1260,7 +1260,7 @@ static int vfio_pci_ioctl_get_pci_hot_reset_info(
struct vfio_pci_hot_reset_info hdr; struct vfio_pci_hot_reset_info hdr;
struct vfio_pci_fill_info fill = {}; struct vfio_pci_fill_info fill = {};
bool slot = false; bool slot = false;
int ret, count; int ret, count = 0;
if (copy_from_user(&hdr, arg, minsz)) if (copy_from_user(&hdr, arg, minsz))
return -EFAULT; return -EFAULT;