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Btrfs: bail out gracefully rather than BUG_ON 

If a file's DIR_ITEM key is invalid (due to memory errors) and gets
written to disk, a future lookup_path can end up with kernel panic due
to BUG_ON().

This gets rid of the BUG_ON(), meanwhile output the corrupted key and
return ENOENT if it's invalid.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reported-by: Guillaume Bouchard <bouchard@mercs-eng.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2017-10-30 11:14:38 -06:00 committed by David Sterba
parent 619c47f3d4
commit 56a0e706fc
1 changed files with 8 additions and 2 deletions
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10
fs/btrfs/inode.c
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@ -5445,6 +5445,14 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
goto out_err; goto out_err;
btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
if (location->type != BTRFS_INODE_ITEM_KEY &&
location->type != BTRFS_ROOT_ITEM_KEY) {
btrfs_warn(root->fs_info,
"%s gets something invalid in DIR_ITEM (name %s, directory ino %llu, location(%llu %u %llu))",
__func__, name, btrfs_ino(BTRFS_I(dir)),
location->objectid, location->type, location->offset);
goto out_err;
}
out: out:
btrfs_free_path(path); btrfs_free_path(path);
return ret; return ret;
@ -5761,8 +5769,6 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
return inode; return inode;
} }
BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY);
index = srcu_read_lock(&fs_info->subvol_srcu); index = srcu_read_lock(&fs_info->subvol_srcu);
ret = fixup_tree_root_location(fs_info, dir, dentry, ret = fixup_tree_root_location(fs_info, dir, dentry,
&location, &sub_root); &location, &sub_root);