From ec763cb00e694864a0f4c0eb709ecbf64a50d7dd Mon Sep 17 00:00:00 2001
From: Jan Kara <jack@suse.cz>
Date: Fri, 17 Jul 2009 10:40:01 -0400
Subject: [PATCH] --- yaml --- r: 163633 b: refs/heads/master c:
 f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 h: refs/heads/master i:   163631:
 fbbd0b74d1e9d544c85e414f516eb640633c730a v: v3

---
 [refs]                  | 2 +-
 trunk/fs/jbd2/journal.c | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 4e277a540294..5c4ef8122aba 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 78f1ddbb498283c2445c11b0dfa666424c301803
+refs/heads/master: f6f50e28f0cb8d7bcdfaacc83129f005dede11b1
diff --git a/trunk/fs/jbd2/journal.c b/trunk/fs/jbd2/journal.c
index e378cb383979..a8a358bc0f21 100644
--- a/trunk/fs/jbd2/journal.c
+++ b/trunk/fs/jbd2/journal.c
@@ -1187,6 +1187,12 @@ static int journal_reset(journal_t *journal)
 
 	first = be32_to_cpu(sb->s_first);
 	last = be32_to_cpu(sb->s_maxlen);
+	if (first + JBD2_MIN_JOURNAL_BLOCKS > last + 1) {
+		printk(KERN_ERR "JBD: Journal too short (blocks %llu-%llu).\n",
+		       first, last);
+		journal_fail_superblock(journal);
+		return -EINVAL;
+	}
 
 	journal->j_first = first;
 	journal->j_last = last;