linux-kernel - [PATCH 5.5 217/257] NFS: Fix use-after-free issues in nfs_pageio_add

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Date:   Thu, 16 Apr 2020 15:24:28 +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,
        Trond Myklebust <trond.myklebust@...merspace.com>
Subject: [PATCH 5.5 217/257] NFS: Fix use-after-free issues in nfs_pageio_add_request()

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

commit dc9dc2febb17f72e9878eb540ad3996f7984239a upstream.

We need to ensure that we create the mirror requests before calling
nfs_pageio_add_request_mirror() on the request we are adding.
Otherwise, we can end up with a use-after-free if the call to
nfs_pageio_add_request_mirror() triggers I/O.

Fixes: c917cfaf9bbe ("NFS: Fix up NFS I/O subrequest creation")
Cc: stable@...r.kernel.org
Signed-off-by: Trond Myklebust <trond.myklebust@...merspace.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/nfs/pagelist.c |   48 ++++++++++++++++++++++++------------------------
 1 file changed, 24 insertions(+), 24 deletions(-)

--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -1177,38 +1177,38 @@ int nfs_pageio_add_request(struct nfs_pa
 	if (desc->pg_error < 0)
 		goto out_failed;
 
-	for (midx = 0; midx < desc->pg_mirror_count; midx++) {
-		if (midx) {
-			nfs_page_group_lock(req);
-
-			/* find the last request */
-			for (lastreq = req->wb_head;
-			     lastreq->wb_this_page != req->wb_head;
-			     lastreq = lastreq->wb_this_page)
-				;
-
-			dupreq = nfs_create_subreq(req, lastreq,
-					pgbase, offset, bytes);
-
-			nfs_page_group_unlock(req);
-			if (IS_ERR(dupreq)) {
-				desc->pg_error = PTR_ERR(dupreq);
-				goto out_failed;
-			}
-		} else
-			dupreq = req;
+	/* Create the mirror instances first, and fire them off */
+	for (midx = 1; midx < desc->pg_mirror_count; midx++) {
+		nfs_page_group_lock(req);
+
+		/* find the last request */
+		for (lastreq = req->wb_head;
+		     lastreq->wb_this_page != req->wb_head;
+		     lastreq = lastreq->wb_this_page)
+			;
+
+		dupreq = nfs_create_subreq(req, lastreq,
+				pgbase, offset, bytes);
+
+		nfs_page_group_unlock(req);
+		if (IS_ERR(dupreq)) {
+			desc->pg_error = PTR_ERR(dupreq);
+			goto out_failed;
+		}
 
-		if (nfs_pgio_has_mirroring(desc))
-			desc->pg_mirror_idx = midx;
+		desc->pg_mirror_idx = midx;
 		if (!nfs_pageio_add_request_mirror(desc, dupreq))
 			goto out_cleanup_subreq;
 	}
 
+	desc->pg_mirror_idx = 0;
+	if (!nfs_pageio_add_request_mirror(desc, req))
+		goto out_failed;
+
 	return 1;
 
 out_cleanup_subreq:
-	if (req != dupreq)
-		nfs_pageio_cleanup_request(desc, dupreq);
+	nfs_pageio_cleanup_request(desc, dupreq);
 out_failed:
 	nfs_pageio_error_cleanup(desc);
 	return 0;