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(parent: 44a4bc9) | patch
ext4: verify the depth of extent tree in ext4_find_extent()
authorTheodore Ts'o <tytso@mit.edu>
Thu, 14 Jun 2018 16:55:10 +0000 (12:55 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 11 Jul 2018 14:29:17 +0000 (16:29 +0200)
commitd69a9df614fc68741efcb0fcc020f05caa99d668
treeffd3ad6f40525b4267ac6c0928ae171a3be90bd5tree | snapshot
parent44a4bc970bfae625d0ec9ecdfefc88c9d93dfe6ccommit | diff
ext4: verify the depth of extent tree in ext4_find_extent()

commit bc890a60247171294acc0bd67d211fa4b88d40ba upstream.

If there is a corupted file system where the claimed depth of the
extent tree is -1, this can cause a massive buffer overrun leading to
sadness.

This addresses CVE-2018-10877.

https://bugzilla.kernel.org/show_bug.cgi?id=199417

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/ext4/ext4_extents.h diff | blob | history
fs/ext4/extents.c diff | blob | history
Linux kernels and configurations used by Zygo.