Fuzzed K12 file causes invalid read in k12.c

This issue was migrated from bug 13431 in our old bug tracker.

Original bug information:

Reporter: ott…@‍gma…
Status: RESOLVED FIXED
Product: Wireshark
Component: Capture file support (libwiretap)
OS: All
Platform: All
Version: Git

Attachments:

k2_crash.rf5: Tektronix K12 file causing the issue

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