vfs: ioctl: prevent double-fetch in dedupe ioctl
This prevents a double-fetch from user space that can lead to to an undersized allocation and heap overflow. Fixes: 54dbc151 ("vfs: hoist the btrfs deduplication ioctl to the vfs") Signed-off-by:Scott Bauer <sbauer@plzdonthack.me> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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