ffi: bugfix: null out return value to padded size.

* ffi.c (ffi_closure_dispatch_safe): In the abort case
when we put zeros in the return value, we must overwrite
the entire ffi_arg cell, in adherence with the special
return value quirk of libffi.

1 files changed, 1 insertions, 1 deletions

diff --git a/ffi.c b/ffi.c
index f2154e13..e6d22814 100644
--- a/ffi.c
+++ b/ffi.c
@@ -2800,7 +2800,7 @@ static void ffi_closure_dispatch_safe(ffi_cif *cif, void *cret,
       if (rtft->release != 0 && retval != nao)
         rtft->release(rtft, retval, convert(mem_t *, cret));
       if (!tfcl->abort_retval)
-        memset(cret, 0, rtft->size);
+        memset(cret, 0, pad_retval(rtft->size));
       else
         ifbe2(rtft->rput, rtft->put)(rtft, tfcl->abort_retval,
                                      convert(mem_t *, cret), self);