38 lines
1.3 KiB
Diff
38 lines
1.3 KiB
Diff
From a585eae6e7ada1ca9271607a4f48dfb17868ab7b Mon Sep 17 00:00:00 2001
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From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
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Date: Mon, 27 Jul 2020 12:01:38 -0300
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Subject: [PATCH] Fixed bug: Negation overflow in getlocal/setlocal
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---
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src/ldebug.c | 7 ++++---
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1 file changed, 4 insertions(+), 3 deletions(-)
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diff --git a/src/ldebug.c b/src/ldebug.c
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index e1389296e..bb0e1d4ac 100644
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--- a/src/ldebug.c
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+++ b/src/ldebug.c
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@@ -133,10 +133,11 @@ static const char *upvalname (Proto *p, int uv) {
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static const char *findvararg (CallInfo *ci, int n, StkId *pos) {
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int nparams = clLvalue(ci->func)->p->numparams;
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- if (n >= cast_int(ci->u.l.base - ci->func) - nparams)
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+ int nvararg = cast_int(ci->u.l.base - ci->func) - nparams;
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+ if (n <= -nvararg)
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return NULL; /* no such vararg */
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else {
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- *pos = ci->func + nparams + n;
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+ *pos = ci->func + nparams - n;
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return "(*vararg)"; /* generic name for any vararg */
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}
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}
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@@ -148,7 +149,7 @@ static const char *findlocal (lua_State *L, CallInfo *ci, int n,
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StkId base;
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if (isLua(ci)) {
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if (n < 0) /* access to vararg values? */
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- return findvararg(ci, -n, pos);
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+ return findvararg(ci, n, pos);
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else {
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base = ci->u.l.base;
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name = luaF_getlocalname(ci_func(ci)->p, n, currentpc(ci));
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