From: Lukas Czerner <lczerner@redhat.com>
Date: Mon, 10 Jan 2011 17:04:55 +0000 (-0500)
Subject: ext4: fix possible overflow in ext4_trim_fs()
X-Git-Tag: v2.6.38-rc1~409^2~25
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4f531501e44206862735e81ddf2b70d0dcf6acf6;p=pandora-kernel.git

ext4: fix possible overflow in ext4_trim_fs()

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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