linux-kernel - [PATCH 4.19 186/191] NFS: Fix memory leaks

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Date:   Fri, 21 Feb 2020 08:42:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wenwen Wang <wenwen@...uga.edu>,
        Anna Schumaker <Anna.Schumaker@...app.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 186/191] NFS: Fix memory leaks

From: Wenwen Wang <wenwen@...uga.edu>

[ Upstream commit 123c23c6a7b7ecd2a3d6060bea1d94019f71fd66 ]

In _nfs42_proc_copy(), 'res->commit_res.verf' is allocated through
kzalloc() if 'args->sync' is true. In the following code, if
'res->synchronous' is false, handle_async_copy() will be invoked. If an
error occurs during the invocation, the following code will not be executed
and the error will be returned . However, the allocated
'res->commit_res.verf' is not deallocated, leading to a memory leak. This
is also true if the invocation of process_copy_commit() returns an error.

To fix the above leaks, redirect the execution to the 'out' label if an
error is encountered.

Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
Signed-off-by: Anna Schumaker <Anna.Schumaker@...app.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfs/nfs42proc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 94f98e190e632..526441de89c1d 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -283,14 +283,14 @@ static ssize_t _nfs42_proc_copy(struct file *src,
 		status = handle_async_copy(res, server, src, dst,
 				&args->src_stateid);
 		if (status)
-			return status;
+			goto out;
 	}
 
 	if ((!res->synchronous || !args->sync) &&
 			res->write_res.verifier.committed != NFS_FILE_SYNC) {
 		status = process_copy_commit(dst, pos_dst, res);
 		if (status)
-			return status;
+			goto out;
 	}
 
 	truncate_pagecache_range(dst_inode, pos_dst,
-- 
2.20.1