Theodore Ts'o d69a9df614 ext4: verify the depth of extent tree in ext4_find_extent() ...

commit bc890a6024 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>

2018-07-11 16:29:17 +02:00

163 KiB

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