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Small issue in 'exprstat'

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The code should not compute an instruction address before checking that
it exists. (Virtually no machine complains of computing an invalid
address, as long as the address is not used, but for ISO C that is
undefined behavior.)
This commit is contained in:
Roberto Ierusalimschy 2020-04-23 14:39:34 -03:00
parent 9e0a8475cd
commit cac075a122
1 changed files with 2 additions and 1 deletions
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3
lparser.c
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@ -1822,8 +1822,9 @@ static void exprstat (LexState *ls) {
restassign(ls, &v, 1);
}
else { /* stat -> func */
Instruction *inst = &getinstruction(fs, &v.v);
Instruction *inst;
check_condition(ls, v.v.k == VCALL, "syntax error");
inst = &getinstruction(fs, &v.v);
SETARG_C(*inst, 1); /* call statement uses no results */
}
}