Out of bounds memory access in TestJSArrayForAllocationSiteInfo.

src/mips/macro-assembler-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5437 matching lines @@
 void MacroAssembler::TestJSArrayForAllocationSiteInfo(
     Register receiver_reg,
     Register scratch_reg,
     Label* allocation_info_present) {
   Label no_info_available;
   ExternalReference new_space_start =
       ExternalReference::new_space_start(isolate());
   ExternalReference new_space_allocation_top =
       ExternalReference::new_space_allocation_top_address(isolate());
   lw(scratch_reg, FieldMemOperand(receiver_reg,
-                                  JSArray::kSize + AllocationSiteInfo::kSize));
+      JSArray::kSize + AllocationSiteInfo::kSize - kHeapObjecTag));
   Branch(&no_info_available, lt, scratch_reg, Operand(new_space_start));
-  Branch(&no_info_available, hs, scratch_reg,
+  Branch(&no_info_available, gt, scratch_reg,
       Operand(new_space_allocation_top));
-  lw(scratch_reg, MemOperand(scratch_reg));
+  lw(scratch_reg, MemOperand(scratch_reg, -AllocationSiteInfo::kSize));
   Branch(allocation_info_present, eq, scratch_reg,
       Operand(Handle<Map>(isolate()->heap()->allocation_site_info_map())));
   bind(&no_info_available);
 }
 
 
 bool AreAliased(Register r1, Register r2, Register r3, Register r4) {
   if (r1.is(r2)) return true;
   if (r1.is(r3)) return true;
   if (r1.is(r4)) return true;
@@ skipping 54 matching lines @@
        opcode == BGTZL);
   opcode = (cond == eq) ? BEQ : BNE;
   instr = (instr & ~kOpcodeMask) | opcode;
   masm_.emit(instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS