| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 66/69] udf: Avoid overflow when session starts at large offset | Date | Mon, 18 Dec 2017 16:48:52 +0100 |
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3.18-stable review patch. If anyone has any objections, please let me know.
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From: Jan Kara <jack@suse.cz>
[ 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> --- fs/udf/super.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -706,7 +706,7 @@ static loff_t udf_check_vsd(struct super 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),
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