Heap-use-after-free in php_var_dump

```
=================================================================
==483290==ERROR: AddressSanitizer: heap-use-after-free on address 0x606000014304 at pc 0x000000bc3ad5 bp 0x7ffc8ab74e40 sp 0x7ffc8ab74e38
READ of size 4 at 0x606000014304 thread T0
    #0 0xbc3ad4 in php_var_dump /src/php-src/ext/standard/var.c:148:8
    #1 0xbc3e00 in php_array_element_dump /src/php-src/ext/standard/var.c:47:2
    #2 0xbc3654 in php_var_dump /src/php-src/ext/standard/var.c:136:5
    #3 0xbc42e2 in php_object_property_dump /src/php-src/ext/standard/var.c:82:3
    #4 0xbc3966 in php_var_dump /src/php-src/ext/standard/var.c:175:7
    #5 0xbc42e2 in php_object_property_dump /src/php-src/ext/standard/var.c:82:3
    #6 0xbc3966 in php_var_dump /src/php-src/ext/standard/var.c:175:7
    #7 0xbc46c0 in zif_var_dump /src/php-src/ext/standard/var.c:218:3
    #8 0xeb4228 in ZEND_DO_ICALL_SPEC_RETVAL_UNUSED_HANDLER /src/php-src/Zend/zend_vm_execute.h:1234:2
    #9 0xfa7ef9 in fuzzer_execute_ex /src/php-src/sapi/fuzzer/fuzzer-execute.c:40:14
    #10 0xd4cccd in zend_call_function /src/php-src/Zend/zend_execute_API.c:895:3
    #11 0xd4e37d in zend_call_known_function /src/php-src/Zend/zend_execute_API.c:985:23
    #12 0xf7ef8c in zend_call_known_instance_method /src/php-src/Zend/zend_API.h:590:2
    #13 0xf7df20 in zend_call_known_instance_method_with_0_params /src/php-src/Zend/zend_API.h:596:2
    #14 0xf7dcb1 in zend_objects_destroy_object /src/php-src/Zend/zend_objects.c:163:3
    #15 0xf8ec69 in zend_objects_store_del /src/php-src/Zend/zend_objects_API.c:178:4
    #16 0xd79be3 in rc_dtor_func /src/php-src/Zend/zend_variables.c:57:2
    #17 0xdb7d29 in i_zval_ptr_dtor /src/php-src/Zend/zend_variables.h:44:4
    #18 0xdb78fb in zend_array_destroy /src/php-src/Zend/zend_hash.c:1636:5
    #19 0xd79be3 in rc_dtor_func /src/php-src/Zend/zend_variables.c:57:2
    #20 0xd79d19 in i_zval_ptr_dtor /src/php-src/Zend/zend_variables.h:44:4
    #21 0xd79c70 in zval_ptr_dtor /src/php-src/Zend/zend_variables.c:84:2
    #22 0xf87492 in zend_std_unset_property /src/php-src/Zend/zend_object_handlers.c:1001:4
    #23 0xe6f777 in ZEND_UNSET_OBJ_SPEC_UNUSED_CONST_HANDLER /src/php-src/Zend/zend_vm_execute.h:32726:3
    #24 0xfa7ef9 in fuzzer_execute_ex /src/php-src/sapi/fuzzer/fuzzer-execute.c:40:14
    #25 0xd4cccd in zend_call_function /src/php-src/Zend/zend_execute_API.c:895:3
    #26 0xd4e37d in zend_call_known_function /src/php-src/Zend/zend_execute_API.c:985:23
    #27 0xf7ef8c in zend_call_known_instance_method /src/php-src/Zend/zend_API.h:590:2
    #28 0xf7df20 in zend_call_known_instance_method_with_0_params /src/php-src/Zend/zend_API.h:596:2
    #29 0xf7dcb1 in zend_objects_destroy_object /src/php-src/Zend/zend_objects.c:163:3
    #30 0xf8dd24 in zend_objects_store_call_destructors /src/php-src/Zend/zend_objects_API.c:56:7
    #31 0xd46b9a in shutdown_destructors /src/php-src/Zend/zend_execute_API.c:248:3
    #32 0xd7efcd in zend_call_destructors /src/php-src/Zend/zend.c:1208:3
    #33 0xc3207f in php_request_shutdown /src/php-src/main/main.c:1755:3
    #34 0xfa83f2 in fuzzer_request_shutdown /src/php-src/sapi/fuzzer/fuzzer-sapi.c:196:2
    #35 0xfa89f1 in fuzzer_do_request_from_buffer /src/php-src/sapi/fuzzer/fuzzer-sapi.c:267:2
    #36 0xfa7d9b in LLVMFuzzerTestOneInput /src/php-src/sapi/fuzzer/fuzzer-execute.c:69:2
    #37 0x63a673 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #38 0x625de2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #39 0x62ba86 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #40 0x654f92 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #41 0x7fdba829eb26 in __libc_start_main (/lib64/libc.so.6+0x25b26)
    #42 0x601c99 in _start (/root/oss-fuzz/build/out/php/php-fuzz-execute+0x601c99)

0x606000014304 is located 4 bytes inside of 56-byte region [0x606000014300,0x606000014338)
freed by thread T0 here:
    #0 0x701132 in free /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:127:3
    #1 0xcfce84 in tracked_free /src/php-src/Zend/zend_alloc.c:2748:2
    #2 0xcf6437 in _efree_custom /src/php-src/Zend/zend_alloc.c:2427:3
    #3 0xcf6341 in _efree /src/php-src/Zend/zend_alloc.c:2547:3
    #4 0xf8ee7c in zend_objects_store_del /src/php-src/Zend/zend_objects_API.c:197:3
    #5 0xd79be3 in rc_dtor_func /src/php-src/Zend/zend_variables.c:57:2
    #6 0xdb7d29 in i_zval_ptr_dtor /src/php-src/Zend/zend_variables.h:44:4
    #7 0xdb78fb in zend_array_destroy /src/php-src/Zend/zend_hash.c:1636:5
    #8 0xd79be3 in rc_dtor_func /src/php-src/Zend/zend_variables.c:57:2
    #9 0xd79d19 in i_zval_ptr_dtor /src/php-src/Zend/zend_variables.h:44:4
    #10 0xd79c70 in zval_ptr_dtor /src/php-src/Zend/zend_variables.c:84:2
    #11 0xf87492 in zend_std_unset_property /src/php-src/Zend/zend_object_handlers.c:1001:4
    #12 0xe6f777 in ZEND_UNSET_OBJ_SPEC_UNUSED_CONST_HANDLER /src/php-src/Zend/zend_vm_execute.h:32726:3
    #13 0xfa7ef9 in fuzzer_execute_ex /src/php-src/sapi/fuzzer/fuzzer-execute.c:40:14
    #14 0xd4cccd in zend_call_function /src/php-src/Zend/zend_execute_API.c:895:3
    #15 0xd4e37d in zend_call_known_function /src/php-src/Zend/zend_execute_API.c:985:23
    #16 0xf7ef8c in zend_call_known_instance_method /src/php-src/Zend/zend_API.h:590:2
    #17 0xf7df20 in zend_call_known_instance_method_with_0_params /src/php-src/Zend/zend_API.h:596:2
    #18 0xf7dcb1 in zend_objects_destroy_object /src/php-src/Zend/zend_objects.c:163:3
    #19 0xf8dd24 in zend_objects_store_call_destructors /src/php-src/Zend/zend_objects_API.c:56:7
    #20 0xd46b9a in shutdown_destructors /src/php-src/Zend/zend_execute_API.c:248:3
    #21 0xd7efcd in zend_call_destructors /src/php-src/Zend/zend.c:1208:3
    #22 0xc3207f in php_request_shutdown /src/php-src/main/main.c:1755:3
    #23 0xfa83f2 in fuzzer_request_shutdown /src/php-src/sapi/fuzzer/fuzzer-sapi.c:196:2
    #24 0xfa89f1 in fuzzer_do_request_from_buffer /src/php-src/sapi/fuzzer/fuzzer-sapi.c:267:2
    #25 0xfa7d9b in LLVMFuzzerTestOneInput /src/php-src/sapi/fuzzer/fuzzer-execute.c:69:2
    #26 0x63a673 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #27 0x625de2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #28 0x62ba86 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #29 0x654f92 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10

previously allocated by thread T0 here:
    #0 0x70139d in malloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
    #1 0xcf6a39 in __zend_malloc /src/php-src/Zend/zend_alloc.c:3030:14
    #2 0xcf39fe in tracked_malloc /src/php-src/Zend/zend_alloc.c:2733:14
    #3 0xcf6267 in _malloc_custom /src/php-src/Zend/zend_alloc.c:2418:10
    #4 0xcf616f in _emalloc /src/php-src/Zend/zend_alloc.c:2537:10
    #5 0xf7e033 in zend_objects_new /src/php-src/Zend/zend_objects.c:178:24
    #6 0xd8c669 in _object_and_properties_init /src/php-src/Zend/zend_API.c:1429:22
    #7 0xd8c8c2 in object_init_ex /src/php-src/Zend/zend_API.c:1452:9
    #8 0xe5f366 in ZEND_NEW_SPEC_CONST_UNUSED_HANDLER /src/php-src/Zend/zend_vm_execute.h:9907:6
    #9 0xfa7ef9 in fuzzer_execute_ex /src/php-src/sapi/fuzzer/fuzzer-execute.c:40:14
    #10 0xde74d6 in zend_execute /src/php-src/Zend/zend_vm_execute.h:58856:2
    #11 0xfa8949 in fuzzer_do_request_from_buffer /src/php-src/sapi/fuzzer/fuzzer-sapi.c:259:5
    #12 0xfa7d9b in LLVMFuzzerTestOneInput /src/php-src/sapi/fuzzer/fuzzer-execute.c:69:2
    #13 0x63a673 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:599:15
    #14 0x625de2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:323:6
    #15 0x62ba86 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:856:9
    #16 0x654f92 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #17 0x7fdba829eb26 in __libc_start_main (/lib64/libc.so.6+0x25b26)

SUMMARY: AddressSanitizer: heap-use-after-free /src/php-src/ext/standard/var.c:148:8 in php_var_dump
Shadow bytes around the buggy address:
  0x0c0c7fffa810: 00 00 00 fa fa fa fa fa 00 00 00 00 00 00 00 fa
  0x0c0c7fffa820: fa fa fa fa 00 00 00 00 00 00 00 fa fa fa fa fa
  0x0c0c7fffa830: fd fd fd fd fd fd fd fa fa fa fa fa fd fd fd fd
  0x0c0c7fffa840: fd fd fd fd fa fa fa fa fd fd fd fd fd fd fd fd
  0x0c0c7fffa850: fa fa fa fa 00 00 00 00 00 00 00 fa fa fa fa fa
=>0x0c0c7fffa860:[fd]fd fd fd fd fd fd fa fa fa fa fa 00 00 00 00
  0x0c0c7fffa870: 00 00 00 fa fa fa fa fa fd fd fd fd fd fd fd fa
  0x0c0c7fffa880: fa fa fa fa 00 00 00 00 00 00 00 fa fa fa fa fa
  0x0c0c7fffa890: 00 00 00 00 00 00 00 fa fa fa fa fa 00 00 00 00
  0x0c0c7fffa8a0: 00 00 00 fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0c7fffa8b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
  Shadow gap:              cc
==483290==ABORTING
```

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