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(parent: 900ac92) | patch
vfs: ioctl: prevent double-fetch in dedupe ioctl
authorScott Bauer <sbauer@plzdonthack.me>
Thu, 28 Jul 2016 01:11:29 +0000 (19:11 -0600)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 10 Aug 2016 10:54:50 +0000 (12:54 +0200)
commit04678f5598322beecf6f06ddf73b2eb6a8b0ef9a
tree820fc7e27b1bd392aab25da2c3db459ae5db5bfetree | snapshot
parent900ac92c5514dd8c63a8f3c91942dcb4cc6bd0f3commit | diff
vfs: ioctl: prevent double-fetch in dedupe ioctl

commit 10eec60ce79187686e052092e5383c99b4420a20 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/ioctl.c diff | blob | history
wrapfs-4.6.y