si_names access one past the end.

Fix for Coverity perl5 CID 45359.

1 files changed, 3 insertions, 1 deletions

diff --git a/deb.c b/deb.c
index bccfc180e7..d16103eb1e 100644
--- a/deb.c
+++ b/deb.c
@@ -217,7 +217,9 @@ Perl_deb_stack_all(pTHX)
     for (;;)
     {
         const size_t si_name_ix = si->si_type+1; /* -1 is a valid index */
-        const char * const si_name = (si_name_ix >= sizeof(si_names)) ? "????" : si_names[si_name_ix];
+        const char * const si_name =
+            si_name_ix < C_ARRAY_LENGTH(si_names) ?
+            si_names[si_name_ix] : "????";
 	I32 ix;
 	PerlIO_printf(Perl_debug_log, "STACK %"IVdf": %s\n",
 						(IV)si_ix, si_name);