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isofs: Fix infinite looping over CE entries
Rock Ridge extensions define so called Continuation Entries (CE) which define where is further space with Rock Ridge data. Corrupted isofs image can contain arbitrarily long chain of these, including a one containing loop and thus causing kernel to end in an infinite loop when traversing these entries. Limit the traversal to 32 entries which should be more than enough space to store all the Rock Ridge data. Change-Id: I2c81b49e68144483186ea5fc35d052529ac001cb Reported-by: P J P <email@example.com> CC: firstname.lastname@example.org Signed-off-by: Jan Kara <email@example.com>
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