From: Lukas Czerner <lczerner@redhat.com>
Date: Fri, 2 Mar 2012 12:09:05 +0000 (+0100)
Subject: ext3: fix start and len arguments handling in ext3_trim_fs()
X-Git-Tag: v3.4-rc1~77^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e703c206135acb458adb705ec44bcc5d2615b37d;p=pandora-kernel.git

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>
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