FFI: Fix cdata equality comparison against strings.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/lj_carith.c b/src/lj_carith.c
index 92fe5597..36d7abb1 100644
--- a/src/lj_carith.c
+++ b/src/lj_carith.c
@@ -62,7 +62,7 @@ static int carith_checkarg(lua_State *L, CTState *cts, CDArith *ca)
       TValue *o2 = i == 0 ? o+1 : o-1;
       CType *ct = ctype_raw(cts, cdataV(o2)->ctypeid);
       ca->ct[i] = NULL;
-      ca->p[i] = NULL;
+      ca->p[i] = (uint8_t *)strVdata(o);
       ok = 0;
       if (ctype_isenum(ct->info)) {
         CTSize ofs;
@@ -73,7 +73,7 @@ static int carith_checkarg(lua_State *L, CTState *cts, CDArith *ca)
           ok = 1;
         } else {
           ca->ct[1-i] = ct;  /* Use enum to improve error message. */
-          ca->p[1-i] = (void *)(intptr_t)1;  /* To make it unequal. */
+          ca->p[1-i] = NULL;
           break;
         }
       }