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authorJan Kara <jack@suse.cz>2017-10-16 11:38:11 +0200
committerJan Kara <jack@suse.cz>2017-10-16 11:38:11 +0200
commitabdc0eb06964fe1d2fea6dd1391b734d0590365d (patch)
tree6c75ded4a2c2df2c1640d61c9a3cfcced615134e /fs/udf/super.c
parent8af634ff9e5c0fd5daff37c9759cd6594345b372 (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>
Diffstat (limited to 'fs/udf/super.c')
-rw-r--r--fs/udf/super.c2
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),