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In gntdev_ioctl_get_offset_for_vaddr, we need to hold mmap_sem while calling find_vma() to avoid potentially having the result freed out from under us. Similarly, the MMU notifier functions need to synchronize with gntdev_vma_close to avoid map->vma being freed during their iteration. Signed-off-by: Daniel De Graaf <[email protected]> Reported-by: Al Viro <[email protected]> Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
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