Btrfs: enhance superblock sanity checks

Validate checksum algorithm during mount and prevent BUG_ON later in
btrfs_super_csum_size.

Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 18 insertions, 5 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 438993e3d832..38c2ee1ca0d5 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -48,7 +48,7 @@
 static struct extent_io_ops btree_extent_io_ops;
 static void end_workqueue_fn(struct btrfs_work *work);
 static void free_fs_root(struct btrfs_root *root);
-static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
+static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
                                     int read_only);
 static void btrfs_destroy_ordered_operations(struct btrfs_root *root);
 static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
@@ -2135,7 +2135,12 @@ int open_ctree(struct super_block *sb,
         /* check FS state, whether FS is broken. */
         fs_info->fs_state |= btrfs_super_flags(disk_super);
 
-        btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY);
+        ret = btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY);
+        if (ret) {
+                printk(KERN_ERR "btrfs: superblock contains fatal errors\n");
+                err = ret;
+                goto fail_alloc;
+        }
 
         /*
          * run through our array of backup supers and setup
@@ -3324,15 +3329,23 @@ out:
         return 0;
 }
 
-static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
+static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
                               int read_only)
 {
+        if (btrfs_super_csum_type(fs_info->super_copy) >= ARRAY_SIZE(btrfs_csum_sizes)) {
+                printk(KERN_ERR "btrfs: unsupported checksum algorithm\n");
+                return -EINVAL;
+        }
+
         if (read_only)
-                return;
+                return 0;
 
-        if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)
+        if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) {
                 printk(KERN_WARNING "warning: mount fs with errors, "
                        "running btrfsck is recommended\n");
+        }
+
+        return 0;
 }
 
 int btrfs_error_commit_super(struct btrfs_root *root)