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lib/mpi: checks for zero divisor length
author
Dmitry Kasatkin
<dmitry.kasatkin@intel.com>
Thu, 26 Jan 2012 17:13:22 +0000
(19:13 +0200)
committer
James Morris
<jmorris@namei.org>
Wed, 1 Feb 2012 13:23:14 +0000
(
00:23
+1100)
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>
lib/mpi/mpi-div.c
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diff --git
a/lib/mpi/mpi-div.c
b/lib/mpi/mpi-div.c
index
c3087d1
..
8a45717
100644
(file)
--- 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.