Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Merge tag 'vfio-v6.0-rc5' of https://github.com/awilliam/linux-vfio
Pull VFIO fix from Alex Williamson:
- Fix zero page refcount leak (Alex Williamson)
* tag 'vfio-v6.0-rc5' of https://github.com/awilliam/linux-vfio:
vfio/type1: Unpin zero pages
+12
+12
drivers/vfio/vfio_iommu_type1.c
+12
drivers/vfio/vfio_iommu_type1.c
···
558
558
ret = pin_user_pages_remote(mm, vaddr, npages, flags | FOLL_LONGTERM,
559
559
pages, NULL, NULL);
560
560
if (ret > 0) {
561
+
int i;
562
+
563
+
/*
564
+
* The zero page is always resident, we don't need to pin it
565
+
* and it falls into our invalid/reserved test so we don't
566
+
* unpin in put_pfn(). Unpin all zero pages in the batch here.
567
+
*/
568
+
for (i = 0 ; i < ret; i++) {
569
+
if (unlikely(is_zero_pfn(page_to_pfn(pages[i]))))
570
+
unpin_user_page(pages[i]);
571
+
}
572
+
561
573
*pfn = page_to_pfn(pages[0]);
562
574
goto done;
563
575
}