diff options
| -rw-r--r-- | src/lj_snap.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/lj_snap.c b/src/lj_snap.c index eb14058e..91880fcf 100644 --- a/src/lj_snap.c +++ b/src/lj_snap.c @@ -214,7 +214,12 @@ static BCReg snap_usedef(jit_State *J, uint8_t *udf, BCReg minslot = bc_a(ins); 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_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); return minslot < maxslot ? minslot : maxslot; } |