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Prevent loop in snap_usedef().

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Reported by XmiliaH.
This commit is contained in:
Mike Pall 2021-07-23 21:33:59 +02:00
parent d87da3d5fe
commit 0e66fc9637
1 changed files with 6 additions and 1 deletions
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7
src/lj_snap.c
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@ -214,7 +214,12 @@ static BCReg snap_usedef(jit_State *J, uint8_t *udf,
BCReg minslot = bc_a(ins); BCReg minslot = bc_a(ins);
if (op >= BC_FORI && op <= BC_JFORL) minslot += FORL_EXT; if (op >= BC_FORI && op <= BC_JFORL) minslot += FORL_EXT;
else if (op >= BC_ITERL && op <= BC_JITERL) minslot += bc_b(pc[-2])-1; else if (op >= BC_ITERL && op <= BC_JITERL) minslot += bc_b(pc[-2])-1;
else if (op == BC_UCLO) { pc += bc_j(ins); break; } else if (op == BC_UCLO) {
ptrdiff_t delta = bc_j(ins);
if (delta < 0) return maxslot; /* Prevent loop. */
pc += delta;
break;
}
for (s = minslot; s < maxslot; s++) DEF_SLOT(s); for (s = minslot; s < maxslot; s++) DEF_SLOT(s);
return minslot < maxslot ? minslot : maxslot; return minslot < maxslot ? minslot : maxslot;
} }