Commit 7447a668 authored by Jan Kara's avatar Jan Kara
Browse files

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: default avatarNageswara R Sastry <rnsastry@linux.vnet.ibm.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent e9e961c9

fs/jbd/journal.c

+6 −0
Original line number Diff line number Diff line
@@ -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;