DTLS: fix access to certificate cache #1450

IvanNardi · 2022-02-21T18:34:18Z

protocols/tls.c:650:54: runtime error: member access within null pointer of type 'const struct ndpi_tcphdr'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior protocols/tls.c:650:54 in
protocols/tls.c:650:54: runtime error: load of null pointer of type 'const u_int16_t' (aka 'const unsigned short')
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior protocols/tls.c:650:54 in
AddressSanitizer:DEADLYSIGNAL
=================================================================
==47401==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x55f7a61b661c bp 0x7f38190f91b0 sp 0x7f38190f70e0 T1)
==47401==The signal is caused by a READ memory access.
==47401==Hint: address points to the zero page.
    #0 0x55f7a61b661c in processCertificateElements /home/ivan/svnrepos/nDPI/src/lib/protocols/tls.c:650:41
    #1 0x55f7a61ac3cc in processCertificate /home/ivan/svnrepos/nDPI/src/lib/protocols/tls.c:792:7
    #2 0x55f7a61d34e1 in processTLSBlock /home/ivan/svnrepos/nDPI/src/lib/protocols/tls.c:846:13

``` protocols/tls.c:650:54: runtime error: member access within null pointer of type 'const struct ndpi_tcphdr' SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior protocols/tls.c:650:54 in protocols/tls.c:650:54: runtime error: load of null pointer of type 'const u_int16_t' (aka 'const unsigned short') SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior protocols/tls.c:650:54 in AddressSanitizer:DEADLYSIGNAL ================================================================= ==47401==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x55f7a61b661c bp 0x7f38190f91b0 sp 0x7f38190f70e0 T1) ==47401==The signal is caused by a READ memory access. ==47401==Hint: address points to the zero page. #0 0x55f7a61b661c in processCertificateElements /home/ivan/svnrepos/nDPI/src/lib/protocols/tls.c:650:41 ntop#1 0x55f7a61ac3cc in processCertificate /home/ivan/svnrepos/nDPI/src/lib/protocols/tls.c:792:7 ntop#2 0x55f7a61d34e1 in processTLSBlock /home/ivan/svnrepos/nDPI/src/lib/protocols/tls.c:846:13 ```