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Avoid out-of-range PC for stack overflow error from snapshot restore.

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Reported by Sergey Kaplun. #1359
This commit is contained in:
Mike Pall
2025-05-28 21:02:31 +02:00
parent 9c8eb7cfe1
commit cd4af8ad80
3 changed files with 10 additions and 15 deletions
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14
src/lj_parse.c
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@@ -1529,23 +1529,11 @@ static void fs_fixup_var(LexState *ls, GCproto *pt, uint8_t *p, size_t ofsvar)
#endif
/* Check if bytecode op returns. */
static int bcopisret(BCOp op)
{
switch (op) {
case BC_CALLMT: case BC_CALLT:
case BC_RETM: case BC_RET: case BC_RET0: case BC_RET1:
return 1;
default:
return 0;
}
}
/* Fixup return instruction for prototype. */
static void fs_fixup_ret(FuncState *fs)
{
BCPos lastpc = fs->pc;
if (lastpc <= fs->lasttarget || !bcopisret(bc_op(fs->bcbase[lastpc-1].ins))) {
if (lastpc <= fs->lasttarget || !bc_isret_or_tail(bc_op(fs->bcbase[lastpc-1].ins))) {
if ((fs->bl->flags & FSCOPE_UPVAL))
bcemit_AJ(fs, BC_UCLO, 0, 0);
bcemit_AD(fs, BC_RET0, 0, 1); /* Need final return. */