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| author | Jan Kara <jack@suse.cz> | 2017-10-16 12:38:11 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-20 12:01:34 +0300 |
| commit | 58617c76ed62f0b9a9b6b5a9b791ee5314937d1e (patch) | |
| tree | 122fc4089e8095965637f4625321f92e41161eb7 | |
| parent | cae8f2343a45475d0ba606fdd457ffce8cb5db01 (diff) | |
| download | linux-58617c76ed62f0b9a9b6b5a9b791ee5314937d1e.tar.xz | |
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>
| -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 e229315bbf7a..592918e7aaba 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -706,7 +706,7 @@ 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), |