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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Hulk Robot <hulkci@huawei.com>,
        Yu Kuai <yukuai3@huawei.com>,
        "Darrick J. Wong" <darrick.wong@oracle.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.4 103/158] xfs: return corresponding errcode if xfs_initialize_perag() fail
Date:   Mon, 23 Nov 2020 13:22:11 +0100
Message-Id: <20201123121824.904549934@linuxfoundation.org>
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References: <20201123121819.943135899@linuxfoundation.org>
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From: Yu Kuai <yukuai3@huawei.com>

[ Upstream commit 595189c25c28a55523354336bf24453242c81c15 ]

In xfs_initialize_perag(), if kmem_zalloc(), xfs_buf_hash_init(), or
radix_tree_preload() failed, the returned value 'error' is not set
accordingly.

Reported-as-fixing: 8b26c5825e02 ("xfs: handle ENOMEM correctly during initialisation of perag structures")
Fixes: 9b2471797942 ("xfs: cache unlinked pointers in an rhashtable")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/xfs/xfs_mount.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index ba5b6f3b2b88a..5a0ce0c2c4bbd 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -195,21 +195,26 @@ xfs_initialize_perag(
 		}
 
 		pag = kmem_zalloc(sizeof(*pag), KM_MAYFAIL);
-		if (!pag)
+		if (!pag) {
+			error = -ENOMEM;
 			goto out_unwind_new_pags;
+		}
 		pag->pag_agno = index;
 		pag->pag_mount = mp;
 		spin_lock_init(&pag->pag_ici_lock);
 		mutex_init(&pag->pag_ici_reclaim_lock);
 		INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC);
-		if (xfs_buf_hash_init(pag))
+
+		error = xfs_buf_hash_init(pag);
+		if (error)
 			goto out_free_pag;
 		init_waitqueue_head(&pag->pagb_wait);
 		spin_lock_init(&pag->pagb_lock);
 		pag->pagb_count = 0;
 		pag->pagb_tree = RB_ROOT;
 
-		if (radix_tree_preload(GFP_NOFS))
+		error = radix_tree_preload(GFP_NOFS);
+		if (error)
 			goto out_hash_destroy;
 
 		spin_lock(&mp->m_perag_lock);
-- 
2.27.0