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udf: Avoid overflow when session starts at large offset
authorJan Kara <jack@suse.cz>
Mon, 16 Oct 2017 09:38:11 +0000 (11:38 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 20 Dec 2017 09:10:36 +0000 (10:10 +0100)
commitd9490e7ca55bafac97fa65a3d34244386469eb50
treec11c782b93118b4c2b362edf8cde913654b7cfa4tree | snapshot (tar.gz zip)
parent42364042b7dd4ba7fed36c1db0a157c7c48282cacommit | diff
udf: Avoid overflow when session starts at large offset

[ Upstream commit abdc0eb06964fe1d2fea6dd1391b734d0590365d ]

When session starts beyond offset 2^31 the arithmetics in
udf_check_vsd() would overflow. Make sure the computation is done in
large enough type.

Reported-by: Cezary Sliwa <sliwa@ifpan.edu.pl>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/udf/super.c diff | blob | blame | history