[PATCH 4.4 035/143] udf: Fix BUG on corrupted inode

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit d288d95842f1503414b7eebce3773bac3390457e ]

When inode is corrupted so that extent type is invalid, some functions
(such as udf_truncate_extents()) will just BUG. Check that extent type
is valid when loading the inode to memory.

Reported-by: Anatoly Trosinenko <anatoly.trosinenko@xxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 fs/udf/inode.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 0e659d9c69a1..613193c6bb42 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1364,6 +1364,12 @@ reread:
 
 	iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
 							ICBTAG_FLAG_AD_MASK;
+	if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
+	    iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
+	    iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
+		ret = -EIO;
+		goto out;
+	}
 	iinfo->i_unique = 0;
 	iinfo->i_lenEAttr = 0;
 	iinfo->i_lenExtents = 0;
-- 
2.19.1