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Fix a wrong buffer size to avoid stack corruption

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[Bug #15986]
This commit is contained in:
Takashi Kokubun 2019-07-14 21:48:22 +09:00
parent 20a3fb3c4b
commit d8cc41c43b
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1 changed files with 2 additions and 2 deletions
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4
mjit_worker.c
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@ -1049,8 +1049,8 @@ convert_unit_to_func(struct rb_mjit_unit *unit)
if (FIXNUM_P(unit->iseq->body->location.first_lineno))
// FIX2INT may fallback to rb_num2long(), which is a method call and dangerous in MJIT worker. So using only FIX2LONG.
iseq_lineno = FIX2LONG(unit->iseq->body->location.first_lineno);
char *iseq_label = alloca(RSTRING_LEN(unit->iseq->body->location.label));
char *iseq_path = alloca(RSTRING_LEN(rb_iseq_path(unit->iseq)));
char *iseq_label = alloca(RSTRING_LEN(unit->iseq->body->location.label) + 1);
char *iseq_path = alloca(RSTRING_LEN(rb_iseq_path(unit->iseq)) + 1);
strcpy(iseq_label, RSTRING_PTR(unit->iseq->body->location.label));
strcpy(iseq_path, RSTRING_PTR(rb_iseq_path(unit->iseq)));