tree ac569403ce4e4c1da33307e862c009810c56c492
parent a0391a3ae91d301c0e59368531a4de5f0b122bcf
author Lukas Czerner <lczerner@redhat.com> 1330690145 +0100
committer Jan Kara <jack@suse.cz> 1330706860 +0100

ext3: fix start and len arguments handling in ext3_trim_fs()

The overflow might happen when passing blocknr into
ext3_get_group_no_and_offset(), because it expects type ext3_fsblk_t
which might be smaller than uint64_t. This will most likely happen when
calling FITRIM with the default argument len = ULLONG_MAX.

Fix this by using "end" variable instead of "start+len" as it is easier
to get right and specifically check that the end is not beyond the end
of the file system, so we are sure that the result of
get_group_no_and_offset() will not overflow. Otherwise truncate it to
the size of the file system.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Jan Kara <jack@suse.cz>