From 3b299709091befc0e02aa33d55ddd5baef006853 Mon Sep 17 00:00:00 2001
From: "J. Bruce Fields" <bfields@redhat.com>
Date: Thu, 20 Mar 2014 21:20:26 -0400
Subject: nfsd4: enforce rd_dircount

As long as we're here, let's enforce the protocol's limit on the number
of directory entries to return in a readdir.

I don't think anyone's ever noticed our lack of enforcement, but maybe
there's more of a chance they will now that we allow larger readdirs.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 4d79e53..3f2a52c 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1033,7 +1033,7 @@ nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *read
 	READ_BUF(24);
 	READ64(readdir->rd_cookie);
 	COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
-	READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
+	READ32(readdir->rd_dircount);
 	READ32(readdir->rd_maxcount);
 	if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 		goto out;
@@ -2720,6 +2720,9 @@ nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
 	if (entry_bytes > cd->rd_maxcount)
 		goto fail;
 	cd->rd_maxcount -= entry_bytes;
+	if (!cd->rd_dircount)
+		goto fail;
+	cd->rd_dircount--;
 	cd->cookie_offset = cookie_offset;
 skip_entry:
 	cd->common.err = nfs_ok;
-- 
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