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| author | Jan Kara <jack@suse.cz> | 2017-10-16 11:38:11 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-20 10:05:01 +0100 |
| commit | b8d510ff71651f2058e947c8004cdcb809c15d61 (patch) | |
| tree | 18502102812e027e8db8898c9ef59d7cba6e5e29 | |
| parent | a114af87c0ba390b0146411f89a2a953ffe3c31f (diff) | |
| download | linux-stable-b8d510ff71651f2058e947c8004cdcb809c15d61.tar.gz linux-stable-b8d510ff71651f2058e947c8004cdcb809c15d61.tar.bz2 linux-stable-b8d510ff71651f2058e947c8004cdcb809c15d61.zip | |
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 81155b9b445b..ee09c97f3ab2 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -705,7 +705,7 @@ 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), |