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path: root/fs/jbd/journal.c
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-rw-r--r--fs/jbd/journal.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
index 9fe061fb877..fea8dd661d2 100644
--- a/fs/jbd/journal.c
+++ b/fs/jbd/journal.c
@@ -1135,6 +1135,14 @@ static int journal_get_superblock(journal_t *journal)
goto out;
}
+ if (be32_to_cpu(sb->s_first) == 0 ||
+ be32_to_cpu(sb->s_first) >= journal->j_maxlen) {
+ printk(KERN_WARNING
+ "JBD: Invalid start block of journal: %u\n",
+ be32_to_cpu(sb->s_first));
+ goto out;
+ }
+
return 0;
out: