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udf: Avoid overflow when session starts at large offset 

[ Upstream commit abdc0eb069 ]

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>
steinar/wifi_calib_4_9_kernel
Jan Kara 2017-10-16 11:38:11 +02:00 committed by Greg Kroah-Hartman
parent 91e0cf85ca
commit b64ab3ca9d
1 changed files with 1 additions and 1 deletions
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2
fs/udf/super.c
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@ -710,7 +710,7 @@ static loff_t udf_check_vsd(struct super_block *sb)
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),