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Bug fix: emergency collection while loading upvalues 

In 'lundump.c', when loading the upvalues of a function, there can be
a read error if the chunk is truncated. In that case, the creation
of the error message can trigger an emergency collection while the
prototype is still anchored. So, the prototype must be GC consistent
before loading the upvales, which implies that it the 'name' fields
must be filled with NULL before the reading.
This commit is contained in:
Roberto Ierusalimschy 2020-07-13 15:38:55 -03:00
parent 454424690d
commit e398e03aa9
1 changed files with 2 additions and 1 deletions
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3
lundump.c
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@ -205,8 +205,9 @@ static void loadUpvalues (LoadState *S, Proto *f) {
n = loadInt(S); n = loadInt(S);
f->upvalues = luaM_newvectorchecked(S->L, n, Upvaldesc); f->upvalues = luaM_newvectorchecked(S->L, n, Upvaldesc);
f->sizeupvalues = n; f->sizeupvalues = n;
for (i = 0; i < n; i++) { for (i = 0; i < n; i++)
f->upvalues[i].name = NULL; f->upvalues[i].name = NULL;
for (i = 0; i < n; i++) {
f->upvalues[i].instack = loadByte(S); f->upvalues[i].instack = loadByte(S);
f->upvalues[i].idx = loadByte(S); f->upvalues[i].idx = loadByte(S);
f->upvalues[i].kind = loadByte(S); f->upvalues[i].kind = loadByte(S);