linux-kernel - [PATCH 4.9 159/164] NFS: Fix use after free in write error path

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Message-Id: <20170523200913.889747644@linuxfoundation.org>
Date:   Tue, 23 May 2017 22:09:36 +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, Fred Isaman <fred.isaman@...il.com>,
        Trond Myklebust <trond.myklebust@...marydata.com>
Subject: [PATCH 4.9 159/164] NFS: Fix use after free in write error path

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Fred Isaman <fred.isaman@...il.com>

commit 1f84ccdf37d0db3a70714d02d51b0b6d45887fb8 upstream.

Signed-off-by: Fred Isaman <fred.isaman@...il.com>
Fixes: 0bcbf039f6b2b ("nfs: handle request add failure properly")
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfs/write.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -548,9 +548,9 @@ static void nfs_write_error_remove_page(
 {
 	nfs_unlock_request(req);
 	nfs_end_page_writeback(req);
-	nfs_release_request(req);
 	generic_error_remove_page(page_file_mapping(req->wb_page),
 				  req->wb_page);
+	nfs_release_request(req);
 }
 
 /*