From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kara Subject: [PATCH] jbd: Fail to load a journal if it is too short Date: Wed, 15 Jul 2009 21:05:16 +0200 Message-ID: <1247684717-16662-1-git-send-email-jack@suse.cz> Cc: tytso@mit.edu, Jan Kara To: linux-ext4@vger.kernel.org Return-path: Received: from cantor2.suse.de ([195.135.220.15]:47784 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932172AbZGOTFV (ORCPT ); Wed, 15 Jul 2009 15:05:21 -0400 Sender: linux-ext4-owner@vger.kernel.org List-ID: 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 Signed-off-by: Jan Kara --- 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