linux-kernel - [PATCH 4.9 042/165] ext4, jbd2: ensure panic when aborting with zero errno

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Message-Id: <20200227132237.370250697@linuxfoundation.org>
Date:   Thu, 27 Feb 2020 14:35:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "zhangyi (F)" <yi.zhang@...wei.com>,
        Jan Kara <jack@...e.cz>, Theodore Tso <tytso@....edu>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 042/165] ext4, jbd2: ensure panic when aborting with zero errno

From: zhangyi (F) <yi.zhang@...wei.com>

[ Upstream commit 51f57b01e4a3c7d7bdceffd84de35144e8c538e7 ]

JBD2_REC_ERR flag used to indicate the errno has been updated when jbd2
aborted, and then __ext4_abort() and ext4_handle_error() can invoke
panic if ERRORS_PANIC is specified. But if the journal has been aborted
with zero errno, jbd2_journal_abort() didn't set this flag so we can
no longer panic. Fix this by always record the proper errno in the
journal superblock.

Fixes: 4327ba52afd03 ("ext4, jbd2: ensure entering into panic after recording an error in superblock")
Signed-off-by: zhangyi (F) <yi.zhang@...wei.com>
Reviewed-by: Jan Kara <jack@...e.cz>
Link: https://lore.kernel.org/r/20191204124614.45424-3-yi.zhang@huawei.com
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/jbd2/checkpoint.c |  2 +-
 fs/jbd2/journal.c    | 15 ++++-----------
 2 files changed, 5 insertions(+), 12 deletions(-)

diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 4d5a5a4cc017c..addb0784dd1c4 100644
--- a/fs/jbd2/checkpoint.c
+++ b/fs/jbd2/checkpoint.c
@@ -168,7 +168,7 @@ void __jbd2_log_wait_for_space(journal_t *journal)
 				       "journal space in %s\n", __func__,
 				       journal->j_devname);
 				WARN_ON(1);
-				jbd2_journal_abort(journal, 0);
+				jbd2_journal_abort(journal, -EIO);
 			}
 			write_lock(&journal->j_state_lock);
 		} else {
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 40c754854b29e..efc8cfd060730 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -2100,12 +2100,10 @@ static void __journal_abort_soft (journal_t *journal, int errno)
 
 	__jbd2_journal_abort_hard(journal);
 
-	if (errno) {
-		jbd2_journal_update_sb_errno(journal);
-		write_lock(&journal->j_state_lock);
-		journal->j_flags |= JBD2_REC_ERR;
-		write_unlock(&journal->j_state_lock);
-	}
+	jbd2_journal_update_sb_errno(journal);
+	write_lock(&journal->j_state_lock);
+	journal->j_flags |= JBD2_REC_ERR;
+	write_unlock(&journal->j_state_lock);
 }
 
 /**
@@ -2147,11 +2145,6 @@ static void __journal_abort_soft (journal_t *journal, int errno)
  * failure to disk.  ext3_error, for example, now uses this
  * functionality.
  *
- * Errors which originate from within the journaling layer will NOT
- * supply an errno; a null errno implies that absolutely no further
- * writes are done to the journal (unless there are any already in
- * progress).
- *
  */
 
 void jbd2_journal_abort(journal_t *journal, int errno)
-- 
2.20.1