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ecall() should preserve stack address referenced from ci[1].

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OP_RETURN accesses ci[1]->stackent that might be broken; fix #3442
This commit is contained in:
Yukihiro "Matz" Matsumoto
2017-02-11 18:13:39 +09:00
parent 0b143898c4
commit 642ab8ecda
1 changed files with 3 additions and 0 deletions
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src/vm.c
+3
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@@ -281,6 +281,7 @@ ecall(mrb_state *mrb, int i)
mrb_value *self = mrb->c->stack;
struct RObject *exc;
int cioff;
mrb_value *nstk;
if (i<0) return;
p = mrb->c->ensure[i];
@@ -289,6 +290,7 @@ ecall(mrb_state *mrb, int i)
mrb->c->ci->eidx = i;
cioff = mrb->c->ci - mrb->c->cibase;
ci = cipush(mrb);
nstk = ci->stackent;
ci->stackent = mrb->c->stack;
ci->mid = ci[-1].mid;
ci->acc = CI_ACC_SKIP;
@@ -300,6 +302,7 @@ ecall(mrb_state *mrb, int i)
exc = mrb->exc; mrb->exc = 0;
mrb_run(mrb, p, *self);
mrb->c->ensure[i] = NULL;
ci->stackent = nstk;
mrb->c->ci = mrb->c->cibase + cioff;
if (!mrb->exc) mrb->exc = exc;
}