udf: Protect rename against modification of moved directory

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When we are renaming a directory to a different directory, we need to
update '..' entry in the moved directory. However nothing prevents moved
directory from being modified and even converted from the in-ICB format
to the normal format which results in a crash. Fix the problem by
locking the moved directory.

Reported-by: syzbot+aebf90eea2671c43112a@syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack@suse.cz>

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This commit is contained in:

Jan Kara 2023-01-18 19:42:35 +01:00

parent 32f123a3f3

commit f950fd0529

1 changed files with 12 additions and 2 deletions

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14

fs/udf/namei.c

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