From e2fe85c236736c866481de288f636ab06ef49787 Mon Sep 17 00:00:00 2001
From: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Date: Thu, 26 Jan 2012 19:13:22 +0200
Subject: lib/mpi: checks for zero divisor length

Divisor length should not be 0.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Reviewed-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

diff --git a/lib/mpi/mpi-div.c b/lib/mpi/mpi-div.c
index c3087d1..8a45717 100644
--- a/lib/mpi/mpi-div.c
+++ b/lib/mpi/mpi-div.c
@@ -149,6 +149,9 @@ int mpi_tdiv_qr(MPI quot, MPI rem, MPI num, MPI den)
 	mpi_ptr_t marker[5];
 	int markidx = 0;
 
+	if (!dsize)
+		return -EINVAL;
+
 	memset(marker, 0, sizeof(marker));
 
 	/* Ensure space is enough for quotient and remainder.
-- 
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