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    Subject[PATCH 4.9 172/177] udf: Avoid overflow when session starts at large offset
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Jan Kara <jack@suse.cz>


    [ 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 | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/fs/udf/super.c
    +++ b/fs/udf/super.c
    @@ -710,7 +710,7 @@ static loff_t udf_check_vsd(struct super
    else
    sectorsize = sb->s_blocksize;

    - sector += (sbi->s_session << sb->s_blocksize_bits);
    + sector += (((loff_t)sbi->s_session) << sb->s_blocksize_bits);

    udf_debug("Starting at sector %u (%ld byte sectors)\n",
    (unsigned int)(sector >> sb->s_blocksize_bits),

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