Although UDF standard allows it, we don't support sparing table larger
than a single block. Check it during mount so that we don't try to
access memory beyond end of buffer.
Reported-by: syzbot+9991561e714f597095da@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/udf/super.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/udf/super.c b/fs/udf/super.c
index 7df371e59eb7..d169c1f20c6d 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1353,6 +1353,12 @@ static int udf_load_sparable_map(struct super_block *sb,
(int)spm->numSparingTables);
return -EIO;
}
+ if (le32_to_cpu(spm->sizeSparingTable) > sb->s_blocksize) {
+ udf_err(sb, "error loading logical volume descriptor: "
+ "Too big sparing table size (%u)\n",
+ le32_to_cpu(spm->sizeSparingTable));
+ return -EIO;
+ }
for (i = 0; i < spm->numSparingTables; i++) {
loc = le32_to_cpu(spm->locSparingTable[i]);
--
2.16.4
