lib/mpi: return error code on dividing by zero

Definitely better to return error code than to divide by zero.

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-pow.c b/lib/mpi/mpi-pow.c
index b04a3cf8008083d8e54f861df465b1f831b98df3..67f3e79af9140e0160a4264b506b41344304e916 100644 (file)
--- a/lib/mpi/mpi-pow.c
+++ b/lib/mpi/mpi-pow.c
@@ -59,7 +59,7 @@ int mpi_powm(MPI res, MPI base, MPI exp, MPI mod)
        ep = exp->d;
 
        if (!msize)
-               msize = 1 / msize;      /* provoke a signal */
+               return -EINVAL;
 
        if (!esize) {
                /* Exponent is zero, result is 1 mod MOD, i.e., 1 or 0