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re: xfs: free the list of recovery items on error

To: tinguely@xxxxxxx
Subject: re: xfs: free the list of recovery items on error
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Fri, 6 Dec 2013 18:49:06 +0300
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
User-agent: Mutt/1.5.21 (2010-09-15)
Hello Mark Tinguely,

The patch 2a84108fe275: "xfs: free the list of recovery items on
error" from Oct 2, 2013, leads to the following
static checker warning: "fs/xfs/xfs_log_recover.c:3621
xlog_recover_process_data()
         warn: 'trans' was already freed."

fs/xfs/xfs_log_recover.c
  3589                          switch (flags) {
  3590                          case XLOG_COMMIT_TRANS:
  3591                                  error = xlog_recover_commit_trans(log,
  3592                                                                  trans, 
pass);

xlog_recover_commit_trans() frees trans on the success path and on some
failure paths.

  3593                                  break;
  3594                          case XLOG_UNMOUNT_TRANS:
  3595                                  error = xlog_recover_unmount_trans(log, 
trans);
  3596                                  break;
  3597                          case XLOG_WAS_CONT_TRANS:
  3598                                  error = 
xlog_recover_add_to_cont_trans(log,
  3599                                                  trans, dp,
  3600                                                  
be32_to_cpu(ohead->oh_len));
  3601                                  break;
  3602                          case XLOG_START_TRANS:
  3603                                  xfs_warn(log->l_mp, "%s: bad 
transaction",
  3604                                          __func__);
  3605                                  ASSERT(0);
  3606                                  error = XFS_ERROR(EIO);
  3607                                  break;
  3608                          case 0:
  3609                          case XLOG_CONTINUE_TRANS:
  3610                                  error = xlog_recover_add_to_trans(log, 
trans,
  3611                                                  dp, 
be32_to_cpu(ohead->oh_len));
  3612                                  break;
  3613                          default:
  3614                                  xfs_warn(log->l_mp, "%s: bad flag 0x%x",
  3615                                          __func__, flags);
  3616                                  ASSERT(0);
  3617                                  error = XFS_ERROR(EIO);
  3618                                  break;
  3619                          }
  3620                          if (error) {
  3621                                  xlog_recover_free_trans(trans);

Double free?

  3622                                  return error;
  3623                          }

regards,
dan carpenter

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