linux-kernel - [PATCH 5.7 151/204] ubifs: Fix wrong orphan node deletion in ubifs_jnl

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Date:   Thu, 20 Aug 2020 11:20:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Zhihao Cheng <chengzhihao1@...wei.com>,
        Richard Weinberger <richard@....at>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 151/204] ubifs: Fix wrong orphan node deletion in ubifs_jnl_update|rename

From: Zhihao Cheng <chengzhihao1@...wei.com>

[ Upstream commit 094b6d1295474f338201b846a1f15e72eb0b12cf ]

There a wrong orphan node deleting in error handling path in
ubifs_jnl_update() and ubifs_jnl_rename(), which may cause
following error msg:

  UBIFS error (ubi0:0 pid 1522): ubifs_delete_orphan [ubifs]:
  missing orphan ino 65

Fix this by checking whether the node has been operated for
adding to orphan list before being deleted,

Signed-off-by: Zhihao Cheng <chengzhihao1@...wei.com>
Fixes: 823838a486888cf484e ("ubifs: Add hashes to the tree node cache")
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/ubifs/journal.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c
index e5ec1afe1c668..2cf05f87565c2 100644
--- a/fs/ubifs/journal.c
+++ b/fs/ubifs/journal.c
@@ -539,7 +539,7 @@ int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir,
 		     const struct fscrypt_name *nm, const struct inode *inode,
 		     int deletion, int xent)
 {
-	int err, dlen, ilen, len, lnum, ino_offs, dent_offs;
+	int err, dlen, ilen, len, lnum, ino_offs, dent_offs, orphan_added = 0;
 	int aligned_dlen, aligned_ilen, sync = IS_DIRSYNC(dir);
 	int last_reference = !!(deletion && inode->i_nlink == 0);
 	struct ubifs_inode *ui = ubifs_inode(inode);
@@ -630,6 +630,7 @@ int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir,
 			goto out_finish;
 		}
 		ui->del_cmtno = c->cmt_no;
+		orphan_added = 1;
 	}
 
 	err = write_head(c, BASEHD, dent, len, &lnum, &dent_offs, sync);
@@ -702,7 +703,7 @@ int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir,
 	kfree(dent);
 out_ro:
 	ubifs_ro_mode(c, err);
-	if (last_reference)
+	if (orphan_added)
 		ubifs_delete_orphan(c, inode->i_ino);
 	finish_reservation(c);
 	return err;
@@ -1218,7 +1219,7 @@ int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir,
 	void *p;
 	union ubifs_key key;
 	struct ubifs_dent_node *dent, *dent2;
-	int err, dlen1, dlen2, ilen, lnum, offs, len;
+	int err, dlen1, dlen2, ilen, lnum, offs, len, orphan_added = 0;
 	int aligned_dlen1, aligned_dlen2, plen = UBIFS_INO_NODE_SZ;
 	int last_reference = !!(new_inode && new_inode->i_nlink == 0);
 	int move = (old_dir != new_dir);
@@ -1334,6 +1335,7 @@ int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir,
 			goto out_finish;
 		}
 		new_ui->del_cmtno = c->cmt_no;
+		orphan_added = 1;
 	}
 
 	err = write_head(c, BASEHD, dent, len, &lnum, &offs, sync);
@@ -1415,7 +1417,7 @@ int ubifs_jnl_rename(struct ubifs_info *c, const struct inode *old_dir,
 	release_head(c, BASEHD);
 out_ro:
 	ubifs_ro_mode(c, err);
-	if (last_reference)
+	if (orphan_added)
 		ubifs_delete_orphan(c, new_inode->i_ino);
 out_finish:
 	finish_reservation(c);
-- 
2.25.1