nilfs2: verify metadata sizes read from disk

[karo-tx-linux.git] / fs / nilfs2 / sufile.c

diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index 84e384dae663e7826577530a403f90c3ee5ff70f..2a869c35c3622386ac0fdc774681df65c59f7093 100644 (file)
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -1169,6 +1169,18 @@ int nilfs_sufile_read(struct super_block *sb, size_t susize,
        void *kaddr;
        int err;
 
+       if (susize > sb->s_blocksize) {
+               printk(KERN_ERR
+                      "NILFS: too large segment usage size: %zu bytes.\n",
+                      susize);
+               return -EINVAL;
+       } else if (susize < NILFS_MIN_SEGMENT_USAGE_SIZE) {
+               printk(KERN_ERR
+                      "NILFS: too small segment usage size: %zu bytes.\n",
+                      susize);
+               return -EINVAL;
+       }
+
        sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO);
        if (unlikely(!sufile))
                return -ENOMEM;