Created attachment 14044 [details]
Reproducers.

Build Information:
Wireshark git master.
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The following crash due to a stack-based out-of-bounds 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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==2067==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7ffe26462c20 at pc 0x0000009cf704 bp 0x7ffe26462b70 sp 0x7ffe26462b68
READ of size 4 at 0x7ffe26462c20 thread T0
    #0 0x9cf703 in getRate wireshark/wiretap/vwr.c:2276:20
    #1 0x9c74f7 in vwr_read_s2_s3_W_rec wireshark/wiretap/vwr.c:1533:25
    #2 0x9bc02a in vwr_process_rec_data wireshark/wiretap/vwr.c:2336:20
    #3 0x9babf2 in vwr_read wireshark/wiretap/vwr.c:653:10
    #4 0x9d64c2 in wtap_read wireshark/wiretap/wtap.c:1314:7
    #5 0x535c1a in load_cap_file wireshark/tshark.c:3479:12
    #6 0x52c1df in main wireshark/tshark.c:2197:13

Address 0x7ffe26462c20 is located in stack of thread T0 at offset 160 in frame
    #0 0x9cf32f in getRate wireshark/wiretap/vwr.c:2261

  This frame has 6 object(s):
    [32, 80) 'canonical_rate_legacy'
    [112, 144) 'canonical_ndbps_20_ht'
    [176, 208) 'canonical_ndbps_40_ht' <== Memory access at offset 160 underflows this variable
    [240, 276) 'canonical_ndbps_20_vht'
    [320, 360) 'canonical_ndbps_40_vht'
    [400, 440) 'canonical_ndbps_80_vht'
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-overflow wireshark/wiretap/vwr.c:2276:20 in getRate
Shadow bytes around the buggy address:
  0x100044c84530: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100044c84540: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100044c84550: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100044c84560: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100044c84570: f1 f1 f1 f1 00 00 00 00 00 00 f2 f2 f2 f2 00 00
=>0x100044c84580: 00 00 f2 f2[f2]f2 00 00 00 00 f2 f2 f2 f2 00 00
  0x100044c84590: 00 00 04 f2 f2 f2 f2 f2 00 00 00 00 00 f2 f2 f2
  0x100044c845a0: f2 f2 00 00 00 00 00 f3 f3 f3 f3 f3 00 00 00 00
  0x100044c845b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100044c845c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x100044c845d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  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
==2067==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.