linux-ext4 - [PATCH] jbd: Fail to load a journal if it is too short

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Message-Id: <1247684717-16662-1-git-send-email-jack@suse.cz>
Date:	Wed, 15 Jul 2009 21:05:16 +0200
From:	Jan Kara <jack@...e.cz>
To:	linux-ext4@...r.kernel.org
Cc:	tytso@....edu, Jan Kara <jack@...e.cz>
Subject: [PATCH] jbd: Fail to load a journal if it is too short

Due to on disk corruption, it can happen that journal is too short. Fail
to load it in such case so that we don't oops somewhere later.

Reported-by: Nageswara R Sastry <rnsastry@...ux.vnet.ibm.com>
Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/jbd/journal.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index 737f724..94a64a1 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -848,6 +848,12 @@ static int journal_reset(journal_t *journal)
 
 	first = be32_to_cpu(sb->s_first);
 	last = be32_to_cpu(sb->s_maxlen);
+	if (first + JFS_MIN_JOURNAL_BLOCKS > last + 1) {
+		printk(KERN_ERR "JBD: Journal too short (blocks %lu-%lu).\n",
+		       first, last);
+		journal_fail_superblock(journal);
+		return -EINVAL;
+	}
 
 	journal->j_first = first;
 	journal->j_last = last;
-- 
1.6.0.2

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