| commit | 10eec60ce79187686e052092e5383c99b4420a20 | [log] [tgz] |
|---|---|---|
| author | Scott Bauer <sbauer@plzdonthack.me> | Wed Jul 27 19:11:29 2016 -0600 |
| committer | Linus Torvalds <torvalds@linux-foundation.org> | Thu Jul 28 15:23:12 2016 -0700 |
| tree | 27093bca5e5208aa8e8e04e28b3cc5df4ecbf0af | |
| parent | 884316deb4c9fdf9becfa31831a9e40717e3026c [diff] |
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>