[git] GCRYPT - branch, master, updated. libgcrypt-1.5.0-178-gd8e99a0

[by Werner Koch]

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- Log -----------------------------------------------------------------
commit d8e99a04dba6a606e879464cd11deee760d1e000
Author: Werner Koch <wk at gnupg.org>
Date:   Mon Aug 5 18:58:41 2013 +0200

    mpi: Improve gcry_mpi_invm to detect bad input.
    
    * mpi/mpi-inv.c (gcry_mpi_invm): Return 0 for bad input.
    --
    
    Without this patch the function may enter and endless loop.
    
    Signed-off-by: Werner Koch <wk at gnupg.org>

diff --git a/mpi/mpi-inv.c b/mpi/mpi-inv.c
index 5d26946..15fa58f 100644
--- a/mpi/mpi-inv.c
+++ b/mpi/mpi-inv.c
@@ -165,6 +165,11 @@ gcry_mpi_invm( gcry_mpi_t x, gcry_mpi_t a, gcry_mpi_t n )
     int sign;
     int odd ;
 
+    if (!mpi_cmp_ui (a, 0))
+        return 0; /* Inverse does not exists.  */
+    if (!mpi_cmp_ui (n, 1))
+        return 0; /* Inverse does not exists.  */
+
     u = mpi_copy(a);
     v = mpi_copy(n);
 

-----------------------------------------------------------------------

Summary of changes:
 mpi/mpi-inv.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)


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