Check for deleted stashes when reporting var names

The stash of the GV is what's being used to look up a global variables name. If
the GV has no stash, we might as well give up early. This fixes a segfault
because S_varname would later assume gv_fullname4 has resolved the glob's full
name and try to use the svu_pv slot of the scalar returned, while all it got
back was undef.

1 files changed, 1 insertions, 1 deletions

diff --git a/sv.c b/sv.c
index 57db4f4894..3d5dc68fa0 100644
--- a/sv.c
+++ b/sv.c
@@ -13695,7 +13695,7 @@ S_find_uninit_var(pTHX_ const OP *const obase, const SV *const uninit_sv,
 
     case OP_GVSV:
 	gv = cGVOPx_gv(obase);
-	if (!gv || (match && GvSV(gv) != uninit_sv))
+	if (!gv || (match && GvSV(gv) != uninit_sv) || !GvSTASH(gv))
 	    break;
 	return varname(gv, '$', 0, NULL, 0, FUV_SUBSCRIPT_NONE);