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authorJan Kara <jack@suse.cz>2009-07-15 20:36:08 +0200
committerJan Kara <jack@suse.cz>2009-07-15 21:26:23 +0200
commit7447a668a3860b66b3c9db86fdea91e355ba59ac (patch)
treef27e2c1df19e6558bce053e8ffa12bd121a30947
parente9e961c9a818a2f24711af493b907a8e40a69efc (diff)
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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@linux.vnet.ibm.com> Signed-off-by: Jan Kara <jack@suse.cz>
-rw-r--r--fs/jbd/journal.c6
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;
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