tree 27093bca5e5208aa8e8e04e28b3cc5df4ecbf0af
parent 884316deb4c9fdf9becfa31831a9e40717e3026c
author Scott Bauer <sbauer@plzdonthack.me> 1469668289 -0600
committer Linus Torvalds <torvalds@linux-foundation.org> 1469744592 -0700

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: 54dbc1517237 ("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>