Kerberos: fix some memory access errors #1514
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```
==19724==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60e00000045e at pc 0x5620b8b3d3cc bp 0x7ffe0fda6b50 sp 0x7ffe0fda6310
READ of size 2 at 0x60e00000045e thread T0
#0 0x5620b8b3d3cb in __interceptor_strncpy (/home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet_with_main+0x63f3cb) (BuildId: ee53ff920c8cd4c226d8520a0d4846d8864726b6)
ntop#1 0x5620b8d9b69c in strncpy_lower /home/ivan/svnrepos/nDPI/src/lib/protocols/kerberos.c:208:4
ntop#2 0x5620b8d995a0 in krb_parse /home/ivan/svnrepos/nDPI/src/lib/protocols/kerberos.c:316:5
ntop#3 0x5620b8d97a90 in ndpi_search_kerberos /home/ivan/svnrepos/nDPI/src/lib/protocols/kerberos.c:687:12
ntop#4 0x5620b8bcef35 in check_ndpi_detection_func /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:4996:4
ntop#5 0x5620b8bd1be8 in check_ndpi_udp_flow_func /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:5072:10
ntop#6 0x5620b8bd159c in ndpi_check_flow_func /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:5105:12
ntop#7 0x5620b8be323a in ndpi_detection_process_packet /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:5924:15
ntop#8 0x5620b8b8f7e0 in LLVMFuzzerTestOneInput /home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet.c:24:3
ntop#9 0x5620b8b8fd1b in main /home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet.c:84:17
ntop#10 0x7f45b32b90b2 in __libc_start_main /build/glibc-sMfBJT/glibc-2.31/csu/../csu/libc-start.c:308:16
ntop#11 0x5620b8acf47d in _start (/home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet_with_main+0x5d147d) (BuildId: ee53ff920c8cd4c226d8520a0d4846d8864726b6)
0x60e00000045e is located 0 bytes to the right of 158-byte region [0x60e0000003c0,0x60e00000045e)
allocated by thread T0 here:
#0 0x5620b8b5283e in malloc (/home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet_with_main+0x65483e) (BuildId: ee53ff920c8cd4c226d8520a0d4846d8864726b6)
ntop#1 0x5620b8b8fc86 in main /home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet.c:70:17
ntop#2 0x7f45b32b90b2 in __libc_start_main /build/glibc-sMfBJT/glibc-2.31/csu/../csu/libc-start.c:308:16
```
```
protocols/kerberos.c:79:52: runtime error: left shift of 255 by 24 places cannot be represented in type 'int'
```
Found by oss-fuzz:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=46670
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=46636
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hl33ta
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May 12, 2022
```
==19724==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60e00000045e at pc 0x5620b8b3d3cc bp 0x7ffe0fda6b50 sp 0x7ffe0fda6310
READ of size 2 at 0x60e00000045e thread T0
#0 0x5620b8b3d3cb in __interceptor_strncpy (/home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet_with_main+0x63f3cb) (BuildId: ee53ff920c8cd4c226d8520a0d4846d8864726b6)
#1 0x5620b8d9b69c in strncpy_lower /home/ivan/svnrepos/nDPI/src/lib/protocols/kerberos.c:208:4
#2 0x5620b8d995a0 in krb_parse /home/ivan/svnrepos/nDPI/src/lib/protocols/kerberos.c:316:5
#3 0x5620b8d97a90 in ndpi_search_kerberos /home/ivan/svnrepos/nDPI/src/lib/protocols/kerberos.c:687:12
#4 0x5620b8bcef35 in check_ndpi_detection_func /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:4996:4
#5 0x5620b8bd1be8 in check_ndpi_udp_flow_func /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:5072:10
#6 0x5620b8bd159c in ndpi_check_flow_func /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:5105:12
#7 0x5620b8be323a in ndpi_detection_process_packet /home/ivan/svnrepos/nDPI/src/lib/ndpi_main.c:5924:15
ntop#8 0x5620b8b8f7e0 in LLVMFuzzerTestOneInput /home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet.c:24:3
ntop#9 0x5620b8b8fd1b in main /home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet.c:84:17
ntop#10 0x7f45b32b90b2 in __libc_start_main /build/glibc-sMfBJT/glibc-2.31/csu/../csu/libc-start.c:308:16
ntop#11 0x5620b8acf47d in _start (/home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet_with_main+0x5d147d) (BuildId: ee53ff920c8cd4c226d8520a0d4846d8864726b6)
0x60e00000045e is located 0 bytes to the right of 158-byte region [0x60e0000003c0,0x60e00000045e)
allocated by thread T0 here:
#0 0x5620b8b5283e in malloc (/home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet_with_main+0x65483e) (BuildId: ee53ff920c8cd4c226d8520a0d4846d8864726b6)
#1 0x5620b8b8fc86 in main /home/ivan/svnrepos/nDPI/fuzz/fuzz_process_packet.c:70:17
#2 0x7f45b32b90b2 in __libc_start_main /build/glibc-sMfBJT/glibc-2.31/csu/../csu/libc-start.c:308:16
```
```
protocols/kerberos.c:79:52: runtime error: left shift of 255 by 24 places cannot be represented in type 'int'
```
Found by oss-fuzz:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=46670
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=46636
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Found by oss-fuzz:
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=46670
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=46636