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| author | Jan Kara <jack@suse.cz> | 2022-05-18 11:33:29 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2022-05-24 15:34:13 -0400 |
| commit | 3ba733f879c2a88910744647e41edeefbc0d92b2 (patch) | |
| tree | b23ac2e1ccd5cd223ccc7cd51ae101698624cc2b /fs/ext4/mballoc.c | |
| parent | 46c116b920ebec58031f0a78c5ea9599b0d2a371 (diff) | |
| download | linux-3ba733f879c2a88910744647e41edeefbc0d92b2.tar.gz | |
ext4: avoid cycles in directory h-tree
A maliciously corrupted filesystem can contain cycles in the h-tree
stored inside a directory. That can easily lead to the kernel corrupting
tree nodes that were already verified under its hands while doing a node
split and consequently accessing unallocated memory. Fix the problem by
verifying traversed block numbers are unique.
Cc: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220518093332.13986-2-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/mballoc.c')
0 files changed, 0 insertions, 0 deletions