Patch "NFSD: Update nfsd_cache_append() to use xdr_stream" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    NFSD: Update nfsd_cache_append() to use xdr_stream

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     nfsd-update-nfsd_cache_append-to-use-xdr_stream.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 49cecd8628a9855cd993792a0377559ea32d5e7c Mon Sep 17 00:00:00 2001
From: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Fri, 10 Nov 2023 11:28:39 -0500
Subject: NFSD: Update nfsd_cache_append() to use xdr_stream

From: Chuck Lever <chuck.lever@xxxxxxxxxx>

commit 49cecd8628a9855cd993792a0377559ea32d5e7c upstream.

When inserting a DRC-cached response into the reply buffer, ensure
that the reply buffer's xdr_stream is updated properly. Otherwise
the server will send a garbage response.

Cc: stable@xxxxxxxxxxxxxxx # v6.3+
Reviewed-by: Jeff Layton <jlayton@xxxxxxxxxx>
Tested-by: Jeff Layton <jlayton@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/nfsd/nfscache.c |   21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

--- a/fs/nfsd/nfscache.c
+++ b/fs/nfsd/nfscache.c
@@ -640,24 +640,17 @@ void nfsd_cache_update(struct svc_rqst *
 	return;
 }
 
-/*
- * Copy cached reply to current reply buffer. Should always fit.
- * FIXME as reply is in a page, we should just attach the page, and
- * keep a refcount....
- */
 static int
 nfsd_cache_append(struct svc_rqst *rqstp, struct kvec *data)
 {
-	struct kvec	*vec = &rqstp->rq_res.head[0];
+	__be32 *p;
 
-	if (vec->iov_len + data->iov_len > PAGE_SIZE) {
-		printk(KERN_WARNING "nfsd: cached reply too large (%zd).\n",
-				data->iov_len);
-		return 0;
-	}
-	memcpy((char*)vec->iov_base + vec->iov_len, data->iov_base, data->iov_len);
-	vec->iov_len += data->iov_len;
-	return 1;
+	p = xdr_reserve_space(&rqstp->rq_res_stream, data->iov_len);
+	if (unlikely(!p))
+		return false;
+	memcpy(p, data->iov_base, data->iov_len);
+	xdr_commit_encode(&rqstp->rq_res_stream);
+	return true;
 }
 
 /*


Patches currently in stable-queue which might be from chuck.lever@xxxxxxxxxx are

queue-6.6/svcrdma-drop-connection-after-an-rdma-read-error.patch
queue-6.6/nfsd-fix-file-memleak-on-client_opens_release.patch
queue-6.6/nfsd-update-nfsd_cache_append-to-use-xdr_stream.patch



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