From: Jan Kara jack@suse.cz
This patch has been added to the stable tree. If you have any objections, please let us know.
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[ 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@microsoft.com --- 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 6299f341967b..97bbcea2978a 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),