Created attachment 14076 [details]
Reproducers.

Build Information:
Wireshark git master.
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The following SIGSEGV crash due to an invalid memory read can be observed in an ASAN build of Wireshark (current git master), by feeding a malformed file to tshark ("$ ./tshark -nVxr /path/to/file"):

Attached are three files which trigger the crash.

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==31034==ERROR: AddressSanitizer: SEGV on unknown address 0x7fc24e20fa84 (pc 0x7fbe445bb082 bp 0x7fff030fefb0 sp 0x7fff030fef00 T0)
    #0 0x7fbe445bb081 in dissect_nbap_MACdPDU_Size wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:1622:79
    #1 0x7fbe433ceb56 in dissect_per_sequence wireshark/epan/dissectors/packet-per.c:1866:12
    #2 0x7fbe445c760d in dissect_nbap_HSDSCH_Initial_Capacity_AllocationItem wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:1650:12
    #3 0x7fbe433b2fa3 in dissect_per_sequence_of_helper wireshark/epan/dissectors/packet-per.c:531:10
    #4 0x7fbe433be23b in dissect_per_constrained_sequence_of wireshark/epan/dissectors/packet-per.c:905:9
    #5 0x7fbe445c7569 in dissect_nbap_HSDSCH_Initial_Capacity_Allocation wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:1663:12
    #6 0x7fbe433ceb56 in dissect_per_sequence wireshark/epan/dissectors/packet-per.c:1866:12
    #7 0x7fbe445da43d in dissect_nbap_CommonMACFlow_Specific_InfoItem_Response wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:1682:12
    #8 0x7fbe433b2fa3 in dissect_per_sequence_of_helper wireshark/epan/dissectors/packet-per.c:531:10
    #9 0x7fbe433be23b in dissect_per_constrained_sequence_of wireshark/epan/dissectors/packet-per.c:905:9
    #10 0x7fbe445da399 in dissect_nbap_CommonMACFlow_Specific_InfoList_Response wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:1695:12
    #11 0x7fbe433ceb56 in dissect_per_sequence wireshark/epan/dissectors/packet-per.c:1866:12
    #12 0x7fbe445da2bd in dissect_nbap_HSDSCH_Common_System_Information_ResponseFDD wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:2120:12
    #13 0x7fbe44546230 in dissect_HSDSCH_Common_System_Information_ResponseFDD_PDU wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:2430:12
    #14 0x7fbe41b43cc1 in call_dissector_through_handle wireshark/epan/packet.c:616:8
    #15 0x7fbe41b365ea in call_dissector_work wireshark/epan/packet.c:691:9
    #16 0x7fbe41b35dbd in dissector_try_uint_new wireshark/epan/packet.c:1148:9
    #17 0x7fbe4456f40e in dissect_ProtocolExtensionFieldExtensionValue wireshark/epan/dissectors/../../asn1/nbap/packet-nbap-template.c:320:11
    #18 0x7fbe433addf0 in dissect_per_open_type_internal wireshark/epan/dissectors/packet-per.c:242:5
    #19 0x7fbe433ae10d in dissect_per_open_type_pdu_new wireshark/epan/dissectors/packet-per.c:263:9
    #20 0x7fbe4456f370 in dissect_nbap_T_extensionValue wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:200:12
    #21 0x7fbe433ceb56 in dissect_per_sequence wireshark/epan/dissectors/packet-per.c:1866:12
    #22 0x7fbe4456f12d in dissect_nbap_ProtocolExtensionField wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:215:12
    #23 0x7fbe433b2fa3 in dissect_per_sequence_of_helper wireshark/epan/dissectors/packet-per.c:531:10
    #24 0x7fbe433be23b in dissect_per_constrained_sequence_of wireshark/epan/dissectors/packet-per.c:905:9
    #25 0x7fbe4456ef09 in dissect_nbap_ProtocolExtensionContainer wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:228:12
    #26 0x7fbe433ceb56 in dissect_per_sequence wireshark/epan/dissectors/packet-per.c:1866:12
    #27 0x7fbe445f23bf in dissect_nbap_CommonMeasurementInitiationRequest wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:263:12
    #28 0x7fbe445644d0 in dissect_CommonMeasurementInitiationRequest_PDU wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:5030:12
    #29 0x7fbe41b43cc1 in call_dissector_through_handle wireshark/epan/packet.c:616:8
    #30 0x7fbe41b365ea in call_dissector_work wireshark/epan/packet.c:691:9
    #31 0x7fbe41b3802d in dissector_try_string wireshark/epan/packet.c:1443:9
    #32 0x7fbe4456e3ce in dissect_InitiatingMessageValue wireshark/epan/dissectors/../../asn1/nbap/packet-nbap-template.c:326:11
    #33 0x7fbe433addf0 in dissect_per_open_type_internal wireshark/epan/dissectors/packet-per.c:242:5
    #34 0x7fbe433ae10d in dissect_per_open_type_pdu_new wireshark/epan/dissectors/packet-per.c:263:9
    #35 0x7fbe4456df10 in dissect_nbap_InitiatingMessage_value wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:702:12
    #36 0x7fbe433ceb56 in dissect_per_sequence wireshark/epan/dissectors/packet-per.c:1866:12
    #37 0x7fbe4456d91d in dissect_nbap_InitiatingMessage wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:719:12
    #38 0x7fbe433cc861 in dissect_per_choice wireshark/epan/dissectors/packet-per.c:1714:13
    #39 0x7fbe4456d881 in dissect_nbap_NBAP_PDU wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:825:12
    #40 0x7fbe4456d740 in dissect_NBAP_PDU_PDU wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:8430:12
    #41 0x7fbe444e889b in dissect_nbap wireshark/epan/dissectors/../../asn1/nbap/packet-nbap-template.c:457:9
    #42 0x7fbe41b43cc1 in call_dissector_through_handle wireshark/epan/packet.c:616:8
    #43 0x7fbe41b365ea in call_dissector_work wireshark/epan/packet.c:691:9
    #44 0x7fbe41b35dbd in dissector_try_uint_new wireshark/epan/packet.c:1148:9
    #45 0x7fbe4378f98b in dissect_payload wireshark/epan/dissectors/packet-sctp.c:2517:9
    #46 0x7fbe43786b88 in dissect_data_chunk wireshark/epan/dissectors/packet-sctp.c:3443:16
    #47 0x7fbe4377fd99 in dissect_sctp_chunk wireshark/epan/dissectors/packet-sctp.c:4360:14
    #48 0x7fbe4377cd03 in dissect_sctp_chunks wireshark/epan/dissectors/packet-sctp.c:4515:9
    #49 0x7fbe4377acdf in dissect_sctp_packet wireshark/epan/dissectors/packet-sctp.c:4678:3
    #50 0x7fbe43778cba in dissect_sctp wireshark/epan/dissectors/packet-sctp.c:4732:3
    #51 0x7fbe41b43cc1 in call_dissector_through_handle wireshark/epan/packet.c:616:8
    #52 0x7fbe41b365ea in call_dissector_work wireshark/epan/packet.c:691:9
    #53 0x7fbe41b35dbd in dissector_try_uint_new wireshark/epan/packet.c:1148:9
    #54 0x7fbe428455f6 in dissect_frame wireshark/epan/dissectors/packet-frame.c:500:11
    #55 0x7fbe41b43cc1 in call_dissector_through_handle wireshark/epan/packet.c:616:8
    #56 0x7fbe41b365ea in call_dissector_work wireshark/epan/packet.c:691:9
    #57 0x7fbe41b402be in call_dissector_only wireshark/epan/packet.c:2662:8
    #58 0x7fbe41b31ccf in call_dissector_with_data wireshark/epan/packet.c:2675:8
    #59 0x7fbe41b3133b in dissect_record wireshark/epan/packet.c:501:3
    #60 0x7fbe41adf3c9 in epan_dissect_run_with_taps wireshark/epan/epan.c:373:2
    #61 0x5264eb in process_packet wireshark/tshark.c:3728:5
    #62 0x51f960 in load_cap_file wireshark/tshark.c:3484:11
    #63 0x515daf in main wireshark/tshark.c:2197:13

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV wireshark/epan/dissectors/../../asn1/nbap/nbap.cnf:1622:79 in dissect_nbap_MACdPDU_Size
==31034==ABORTING
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This bug is subject to a 90 day disclosure deadline. If 90 days elapse without a broadly available patch, then the bug report will automatically become visible to the public.