diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
index 6e9369b19f89d0da165f6573fa924cc6af385c98..a00e28d1225dc8db4f1d0d68bb964740960e4b44 100644
--- a/fs/nfsd/nfsproc.c
+++ b/fs/nfsd/nfsproc.c
@@ -189,6 +189,7 @@ nfsd_proc_read(struct svc_rqst *rqstp)
 				argp->count);
 		argp->count = NFSSVC_MAXBLKSIZE_V2;
 	}
+	argp->count = min_t(u32, argp->count, rqstp->rq_res.buflen);
 	svc_reserve_auth(rqstp, (19<<2) + argp->count + 4);
 
 	resp->count = argp->count;