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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Arthur Marsh <arthur.marsh@internode.on.net>,
        Theodore Tso <tytso@mit.edu>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 184/190] ext4: fix block validity checks for journal inodes using indirect blocks
Date:   Fri, 13 Sep 2019 14:07:19 +0100
Message-Id: <20190913130614.571217202@linuxfoundation.org>
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[ Upstream commit 170417c8c7bb2cbbdd949bf5c443c0c8f24a203b ]

Commit 345c0dbf3a30 ("ext4: protect journal inode's blocks using
block_validity") failed to add an exception for the journal inode in
ext4_check_blockref(), which is the function used by ext4_get_branch()
for indirect blocks.  This caused attempts to read from the ext3-style
journals to fail with:

[  848.968550] EXT4-fs error (device sdb7): ext4_get_branch:171: inode #8: block 30343695: comm jbd2/sdb7-8: invalid block

Fix this by adding the missing exception check.

Fixes: 345c0dbf3a30 ("ext4: protect journal inode's blocks using block_validity")
Reported-by: Arthur Marsh <arthur.marsh@internode.on.net>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ext4/block_validity.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/ext4/block_validity.c b/fs/ext4/block_validity.c
index 9409b1e11a22e..cd7129b622f85 100644
--- a/fs/ext4/block_validity.c
+++ b/fs/ext4/block_validity.c
@@ -275,6 +275,11 @@ int ext4_check_blockref(const char *function, unsigned int line,
 	__le32 *bref = p;
 	unsigned int blk;
 
+	if (ext4_has_feature_journal(inode->i_sb) &&
+	    (inode->i_ino ==
+	     le32_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_journal_inum)))
+		return 0;
+
 	while (bref < p+max) {
 		blk = le32_to_cpu(*bref++);
 		if (blk &&
-- 
2.20.1