Add assert for potential access beyond array bounds in m1np

The mpexp code has an access into m1np:

  for (i=n-1; i>0; i--,n--) { if (m1np[i][p]+m2>0) break; }

which could break for p >= 18 or i >= 7.  Fortunately this code is
never called due to the way the exp function is implemented since
values having exponent less than -55 return 1.0.  Make sure that if it
gets called in future, it is trapped.

1 files changed, 3 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index fe304e41a9..d0c10b5ff2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2013-01-02  Siddhesh Poyarekar  <siddhesh@redhat.com>
 
+	* sysdeps/ieee754/dbl-64/mpexp.c (__mpexp): Add assert to
+	check access beyond bounds of m1np.
+
 	* sysdeps/ieee754/dbl-64/mpa.c [! NO__CONST]: New constant
 	MPTWO.
 	(__inv): Remove local variable MPTWO to use the global