reader_util: fix TZSP decapsulation #1460

IvanNardi · 2022-02-27T12:04:50Z

==38674==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60400008957f at pc 0x5653fcee6434 bp 0x7ffe9b554b50 sp 0x7ffe9b554b48
READ of size 1 at 0x60400008957f thread T0
    #0 0x5653fcee6433 in ndpi_workflow_process_packet /home/ivan/svnrepos/nDPI/example/reader_util.c:2050:18
    #1 0x5653fce9fc0d in LLVMFuzzerTestOneInput /home/ivan/svnrepos/nDPI/fuzz/fuzz_ndpi_reader.c:107:7
    #2 0x5653fcea03eb in main /home/ivan/svnrepos/nDPI/fuzz/fuzz_ndpi_reader.c:179:17
    #3 0x7fe71dc3d0b2 in __libc_start_main /build/glibc-YbNSs7/glibc-2.31/csu/../csu/libc-start.c:308:16
    #4 0x5653fcddf67d in _start (/home/ivan/svnrepos/nDPI/fuzz/fuzz_ndpi_reader_with_main+0x58a67d) (BuildId: 525418a27e8c37d6c492cc3220e0e97809c40f98)

0x60400008957f is located 0 bytes to the right of 47-byte region [0x604000089550,0x60400008957f)
allocated by thread T0 here:

Found by oss-fuzz
See: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=45036

``` ==38674==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60400008957f at pc 0x5653fcee6434 bp 0x7ffe9b554b50 sp 0x7ffe9b554b48 READ of size 1 at 0x60400008957f thread T0 #0 0x5653fcee6433 in ndpi_workflow_process_packet /home/ivan/svnrepos/nDPI/example/reader_util.c:2050:18 ntop#1 0x5653fce9fc0d in LLVMFuzzerTestOneInput /home/ivan/svnrepos/nDPI/fuzz/fuzz_ndpi_reader.c:107:7 ntop#2 0x5653fcea03eb in main /home/ivan/svnrepos/nDPI/fuzz/fuzz_ndpi_reader.c:179:17 ntop#3 0x7fe71dc3d0b2 in __libc_start_main /build/glibc-YbNSs7/glibc-2.31/csu/../csu/libc-start.c:308:16 ntop#4 0x5653fcddf67d in _start (/home/ivan/svnrepos/nDPI/fuzz/fuzz_ndpi_reader_with_main+0x58a67d) (BuildId: 525418a27e8c37d6c492cc3220e0e97809c40f98) 0x60400008957f is located 0 bytes to the right of 47-byte region [0x604000089550,0x60400008957f) allocated by thread T0 here: ``` Found by oss-fuzz See: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=45036