From b8d510ff71651f2058e947c8004cdcb809c15d61 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Mon, 16 Oct 2017 11:38:11 +0200 Subject: [PATCH] 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 Signed-off-by: Jan Kara Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- fs/udf/super.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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), -- 2.20.1