diff options
| author | Jan Kara <jack@suse.cz> | 2017-10-16 11:38:11 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-20 10:07:33 +0100 |
| commit | b64ab3ca9d31162cbdbd8acc2d5b68cf37302527 (patch) | |
| tree | df963a45a17854db39fe1f67ff9f66fae5a0a4e2 /fs | |
| parent | 91e0cf85caea7f977361f662941100821370d74e (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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/udf/super.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c index 4942549e7dc8..4b1f6d5372c3 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -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), |