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vm.c: make stack_extend_alloc cover the frame offset #7305

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Merged
matz merged 1 commit into from
Aug 22, 2026
+4 −1
Merged

vm.c: make stack_extend_alloc cover the frame offset #7305

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5 changes: 4 additions & 1 deletion src/vm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -190,7 +190,10 @@ stack_extend_alloc(mrb_state *mrb, mrb_int room)
mrb_value *oldbase = mrb->c->stbase;
size_t oldsize = mrb->c->stend - mrb->c->stbase;
size_t size = oldsize;
size_t off = mrb->c->ci->stack ? mrb->c->stend - mrb->c->ci->stack : 0;
/* ci->stack can sit past stend when an embedder enters the VM with an
undersized stack, since cipush places the frame before the stack is
extended. The base size must cover the frame offset. */
size_t off = mrb->c->ci->stack ? mrb->c->ci->stack - oldbase : 0;

if (off > size) size = off;
#ifdef MRB_STACK_EXTEND_DOUBLING
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