Avoid UB with flexible array member

Accessing past the end of an array is technically UB. Use C99 flexible
array member instead to avoid the UB and simplify allocation size
calculation.

See also: DCL38-C in the SEI CERT C Coding Standard

1 files changed, 2 insertions, 2 deletions

diff --git a/compile.c b/compile.c
index bd249a57c0..d294faa7b4 100644
--- a/compile.c
+++ b/compile.c
@@ -3951,7 +3951,7 @@ compile_keyword_arg(rb_iseq_t *iseq, LINK_ANCHOR *const ret,
 	{
 	    int len = (int)node->nd_alen / 2;
             struct rb_callinfo_kwarg *kw_arg =
-                rb_xmalloc_mul_add(len - 1, sizeof(VALUE), sizeof(struct rb_callinfo_kwarg));
+                rb_xmalloc_mul_add(len, sizeof(VALUE), sizeof(struct rb_callinfo_kwarg));
 	    VALUE *keywords = kw_arg->keywords;
 	    int i = 0;
 	    kw_arg->keyword_len = len;
@@ -10394,7 +10394,7 @@ ibf_load_ci_entries(const struct ibf_load *load,
             struct rb_callinfo_kwarg *kwarg = NULL;
             int kwlen = (int)ibf_load_small_value(load, &reading_pos);
             if (kwlen > 0) {
-                kwarg = rb_xmalloc_mul_add(kwlen - 1, sizeof(VALUE), sizeof(struct rb_callinfo_kwarg));;
+                kwarg = rb_xmalloc_mul_add(kwlen, sizeof(VALUE), sizeof(struct rb_callinfo_kwarg));
                 kwarg->keyword_len = kwlen;
                 for (int j=0; j<kwlen; j++) {
                     VALUE keyword = ibf_load_small_value(load, &reading_pos);