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iommufd: Reject invalid read count in iommufd_fault_fops_read()

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The read count must be large enough to hold one fault or a group's faults.

iommufd_fault_fops_read() does not validate the count, but returns 0 as if
the read had succeeded while leaving the pending fault in the queue.

Return -EINVAL in the undersize cases.

Fixes: 07838f7fd5 ("iommufd: Add iommufd fault object")
Link: https://patch.msgid.link/r/85c118a606fbedc5c132a1f5ec223a5ba23b92d2.1780343944.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>
This commit is contained in:
Nicolin Chen 2026-06-01 13:42:35 -07:00 committed by Jason Gunthorpe
parent 489e63dd12
commit 47916a54ee
1 changed files with 3 additions and 0 deletions
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3
drivers/iommu/iommufd/eventq.c
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@ -142,6 +142,9 @@ static ssize_t iommufd_fault_fops_read(struct file *filep, char __user *buf,
if (done >= count ||
group->fault_count * fault_size > count - done) {
iommufd_fault_deliver_restore(fault, group);
/* Read count doesn't fit the first fault group */
if (done == 0)
rc = -EINVAL;
break;
}