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Corrected bug in 'luaD_tryfuncTM'

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The pointer to the metamethod can be invalidated by a finalizer that
can run during a GC in 'checkstackGCp'. (This commit also fixes a
detail in the manual.) Bug introduced in commit 91673a8ec.
This commit is contained in:
Roberto Ierusalimschy 2021-11-16 14:35:06 -03:00
parent e8deac5a41
commit 6b3e116d44
2 changed files with 3 additions and 2 deletions
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3
ldo.c
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@ -388,9 +388,10 @@ static void rethook (lua_State *L, CallInfo *ci, int nres) {
** an error if there is no '__call' metafield.
*/
StkId luaD_tryfuncTM (lua_State *L, StkId func) {
const TValue *tm = luaT_gettmbyobj(L, s2v(func), TM_CALL);
const TValue *tm;
StkId p;
checkstackGCp(L, 1, func); /* space for metamethod */
tm = luaT_gettmbyobj(L, s2v(func), TM_CALL); /* (after previous GC) */
if (l_unlikely(ttisnil(tm)))
luaG_callerror(L, s2v(func)); /* nothing to call */
for (p = L->top; p > func; p--) /* open space for metamethod */

2
manual/manual.of
View File

@ -6247,7 +6247,7 @@ to its caller.
}
@LibEntry{error (message [, level])|
Raises an error @see{error} with @{message} as the error object.
Raises an error @see{error} with @id{message} as the error object.
This function never returns.
Usually, @id{error} adds some information about the error position