ext4: fix possible overflow in ext4_trim_fs()

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When determining last group through ext4_get_group_no_and_offset() the
result may be wrong in cases when range->start and range-len are too
big, because it may overflow when summing up those two numbers.

Fix that by checking range->len and limit its value to
ext4_blocks_count(). This commit was tested by myself with expected
result.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>

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Lukas Czerner 2011-01-10 12:04:55 -05:00 • committed by Theodore Ts'o

parent b72143ab3e

commit 4f531501e4

1 changed files with 6 additions and 0 deletions

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fs/ext4/mballoc.c

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