aot_reloc_x86_64: Fix pointer overflows (#809)

Fix pointer overflow of `(uint8 *)symbol_addr + reloc_addend` detected by UBSan: ``` core/iwasm/aot/arch/aot_reloc_x86_64.c:232:43: runtime error: addition of unsigned offset to 0x000041209004 overflowed to 0x000041209000 SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior core/iwasm/aot/arch/aot_reloc_x86_64.c:232:43 ```
bytecodealliance · Nov 8, 2021 · 2613a68 · 2613a68
1 parent 487072a
commit 2613a68
Showing 1 changed file with 4 additions and 3 deletions.
diff --git a/core/iwasm/aot/arch/aot_reloc_x86_64.c b/core/iwasm/aot/arch/aot_reloc_x86_64.c
@@ -225,12 +225,13 @@ apply_relocation(AOTModule *module, uint8 *target_section_addr,
                       - get_plt_table_size()
                       + get_plt_item_size() * symbol_index;
                 target_addr = (intptr_t) /* L + A - P */
-                    (plt + reloc_addend - (target_section_addr + reloc_offset));
+                    ((uintptr_t)plt + reloc_addend
+                     - (uintptr_t)(target_section_addr + reloc_offset));
             }
             else {
                 target_addr = (intptr_t) /* L + A - P */
-                    ((uint8 *)symbol_addr + reloc_addend
-                     - (target_section_addr + reloc_offset));
+                    ((uintptr_t)symbol_addr + reloc_addend
+                     - (uintptr_t)(target_section_addr + reloc_offset));
             }
 
 #if defined(BH_PLATFORM_WINDOWS)