[PATCH v2] hfsplus: Remove the duplicate attr inode dirty marking action

[Edward Adam Davis]

Syzbot reported a null-ptr-deref in [1].
If the attributes file is not loaded during system mount, a trigger
occurs [1] when setxattr is executed in userspace.

Remove the first mark attr inode dirty operation.

[1]
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
Call Trace:
 hfsplus_setxattr+0x124/0x340 fs/hfsplus/xattr.c:555
 hfsplus_trusted_setxattr+0x40/0x60 fs/hfsplus/xattr_trusted.c:30
 __vfs_setxattr+0x43c/0x480 fs/xattr.c:218
 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:252
 vfs_setxattr+0x163/0x360 fs/xattr.c:339
 do_setxattr fs/xattr.c:654 [inline]

Reported-by: syzbot+bc70a12e438dadba4fb4@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: ee8422d00b7c ("hfsplus: fix potential Allocation File corruption after fsync")
Closes: https://syzkaller.appspot.com/bug?extid=bc70a12e438dadba4fb4
Signed-off-by: Edward Adam Davis <eadavis@xxxxxx>
---
v1 -> v2: just remove first mark dirty

 fs/hfsplus/xattr.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/hfsplus/xattr.c b/fs/hfsplus/xattr.c
index 452a1f9becb2..21a1c196c71f 100644
--- a/fs/hfsplus/xattr.c
+++ b/fs/hfsplus/xattr.c
@@ -317,7 +317,6 @@ static int hfsplus_create_attributes_file(struct super_block *sb)
 		next_node++;
 	}
 
-	hfsplus_mark_inode_dirty(HFSPLUS_ATTR_TREE_I(sb), HFSPLUS_I_ATTR_DIRTY);
 	hfsplus_mark_inode_dirty(attr_file, HFSPLUS_I_ATTR_DIRTY);
 
 	sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
-- 
2.43.0