diff options
| author | Jan Kara <jack@suse.cz> | 2017-10-16 11:38:11 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2017-10-16 11:38:11 +0200 |
| commit | abdc0eb06964fe1d2fea6dd1391b734d0590365d (patch) | |
| tree | 6c75ded4a2c2df2c1640d61c9a3cfcced615134e | |
| parent | 8af634ff9e5c0fd5daff37c9759cd6594345b372 (diff) | |
udf: Avoid overflow when session starts at large offset
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>
| -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 99cb81d0077f..08bf097507f6 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -703,7 +703,7 @@ 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), |