iommufd: Rewind header length in done if iommufd_veventq_fops_read() fails

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When the first event copy fails, rc = -EFAULT will not be reported as done
is set to the length of the copied header.

Rewind it to report rc correctly.

Fixes: e36ba5ab80 ("iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC")
Link: https://patch.msgid.link/r/78f8caeb6a5d667a26b870e3068cec47dd4b5be1.1780343944.git.nicolinc@nvidia.com
Cc: stable@vger.kernel.org
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

...

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Nicolin Chen 2026-06-01 13:42:32 -07:00 • committed by Jason Gunthorpe

parent f25989c190

commit 01e41ad76c

1 changed files with 1 additions and 0 deletions

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drivers/iommu/iommufd/eventq.c

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