linux-kernel - [PATCH AUTOSEL 4.9 16/21] NFS: Fix memory leaks in nfs_pageio_stop

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Message-Id: <20200415114748.15713-16-sashal@kernel.org>
Date:   Wed, 15 Apr 2020 07:47:43 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Trond Myklebust <trond.myklebust@...merspace.com>,
        Sasha Levin <sashal@...nel.org>, linux-nfs@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 16/21] NFS: Fix memory leaks in nfs_pageio_stop_mirroring()

From: Trond Myklebust <trond.myklebust@...merspace.com>

[ Upstream commit 862f35c94730c9270833f3ad05bd758a29f204ed ]

If we just set the mirror count to 1 without first clearing out
the mirrors, we can leak queued up requests.

Signed-off-by: Trond Myklebust <trond.myklebust@...merspace.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfs/pagelist.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index b6e25126a0b0f..529f3a5762637 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -851,15 +851,6 @@ static int nfs_pageio_setup_mirroring(struct nfs_pageio_descriptor *pgio,
 	return 0;
 }
 
-/*
- * nfs_pageio_stop_mirroring - stop using mirroring (set mirror count to 1)
- */
-void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio)
-{
-	pgio->pg_mirror_count = 1;
-	pgio->pg_mirror_idx = 0;
-}
-
 static void nfs_pageio_cleanup_mirroring(struct nfs_pageio_descriptor *pgio)
 {
 	pgio->pg_mirror_count = 1;
@@ -1285,6 +1276,14 @@ void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index)
 	}
 }
 
+/*
+ * nfs_pageio_stop_mirroring - stop using mirroring (set mirror count to 1)
+ */
+void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio)
+{
+	nfs_pageio_complete(pgio);
+}
+
 int __init nfs_init_nfspagecache(void)
 {
 	nfs_page_cachep = kmem_cache_create("nfs_page",
-- 
2.20.1