[PATCH] fat: Fix using uninitialized fields of fat_inode/fsinfo_inode

[OGAWA Hirofumi]

Recently fallocate patch was merged and it uses
MSDOS_I(inode)->mmu_private at fat_evict_inode(). However,
fat_inode/fsinfo_inode that was introduced in past didn't initialize
MSDOS_I(inode) properly.

With those combinations, it became the cause of accessing random entry
in FAT area.

Reported-by: Moreno Bartalucci <moreno.bartalucci@xxxxxxxxxxxx>
Tested-by: Moreno Bartalucci <moreno.bartalucci@xxxxxxxxxxxx>
CC: stable@xxxxxxxxxxxxxxx
Signed-off-by: OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
---

 fs/fat/inode.c |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff -puN fs/fat/inode.c~fat-fix-fsinfo_inode fs/fat/inode.c
--- linux/fs/fat/inode.c~fat-fix-fsinfo_inode	2017-03-07 12:34:54.507838051 +0900
+++ linux-hirofumi/fs/fat/inode.c	2017-03-08 03:48:37.877751531 +0900
@@ -1359,6 +1359,16 @@ out:
 	return 0;
 }
 
+static void fat_dummy_inode_init(struct inode *inode)
+{
+	/* Initialize this dummy inode to work as no-op. */
+	MSDOS_I(inode)->mmu_private = 0;
+	MSDOS_I(inode)->i_start = 0;
+	MSDOS_I(inode)->i_logstart = 0;
+	MSDOS_I(inode)->i_attrs = 0;
+	MSDOS_I(inode)->i_pos = 0;
+}
+
 static int fat_read_root(struct inode *inode)
 {
 	struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
@@ -1803,12 +1813,13 @@ int fat_fill_super(struct super_block *s
 	fat_inode = new_inode(sb);
 	if (!fat_inode)
 		goto out_fail;
-	MSDOS_I(fat_inode)->i_pos = 0;
+	fat_dummy_inode_init(fat_inode);
 	sbi->fat_inode = fat_inode;
 
 	fsinfo_inode = new_inode(sb);
 	if (!fsinfo_inode)
 		goto out_fail;
+	fat_dummy_inode_init(fsinfo_inode);
 	fsinfo_inode->i_ino = MSDOS_FSINFO_INO;
 	sbi->fsinfo_inode = fsinfo_inode;
 	insert_inode_hash(fsinfo_inode);
_
-- 
OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>