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| author | Jan Kara <jack@suse.cz> | 2009-07-17 14:40:01 (GMT) |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-07-17 14:40:01 (GMT) |
| commit | f6f50e28f0cb8d7bcdfaacc83129f005dede11b1 (patch) | |
| tree | f7a0ee7cc686c0687cd4020185265ae0cd29471b | |
| parent | 78f1ddbb498283c2445c11b0dfa666424c301803 (diff) | |
| download | linux-f6f50e28f0cb8d7bcdfaacc83129f005dede11b1.tar.xz | |
jbd2: 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.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| -rw-r--r-- | fs/jbd2/journal.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index e378cb3..a8a358b 100644 --- a/fs/jbd2/journal.c +++ b/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; |