linux-ext4 - [PATCH] ext4: fix special inode number checks in __ext4

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Date:   Mon, 31 Dec 2018 22:37:46 -0500
From:   Theodore Ts'o <tytso@....edu>
To:     Ext4 Developers List <linux-ext4@...r.kernel.org>
CC:     <dan.carpenter@...cle.com>, Theodore Ts'o <tytso@....edu>,
        <stable@...nel.org>
Subject: [PATCH] ext4: fix special inode number checks in __ext4_iget()

The check for special (reserved) inode number checks in __ext4_iget()
was broken by commit 8a363970d1dc: ("ext4: avoid declaring fs
inconsistent due to invalid file handles").  This was caused by a
botched reversal of the sense of the flag now known as
EXT4_IGET_SPECIAL (when it was previously named EXT4_IGET_NORMAL).
Fix the logic appropriately.

Fixes: 8a363970d1dc ("ext4: avoid declaring fs inconsistent...")
Signed-off-by: Theodore Ts'o <tytso@....edu>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Cc: stable@...nel.org
---
 fs/ext4/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 165ff331d998..34d7e0703cc6 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -4834,7 +4834,7 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
 	gid_t i_gid;
 	projid_t i_projid;
 
-	if (((flags & EXT4_IGET_NORMAL) &&
+	if ((!(flags & EXT4_IGET_SPECIAL) &&
 	     (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)) ||
 	    (ino < EXT4_ROOT_INO) ||
 	    (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))) {
-- 
2.19.1