From d288d95842f1503414b7eebce3773bac3390457e Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Wed, 12 Dec 2018 14:29:20 +0100
Subject: [PATCH] udf: Fix BUG on corrupted inode
Git-commit: d288d95842f1503414b7eebce3773bac3390457e
Patch-mainline: v5.0-rc1
References: bsc#1207107

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@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Jan Kara <jack@suse.cz>

---
 fs/udf/inode.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 5df554a9f9c9..ae796e10f68b 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -1357,6 +1357,12 @@ static int udf_read_inode(struct inode *inode, bool hidden_inode)
 
 	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;
-- 
2.35.3