Crash test cases discovered with the AFL fuzzer#33

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voetsjoeba wants to merge 11 commits intosteveire:masterfrom

voetsjoeba:afl-fuzz-01

Commits on Mar 17, 2017

AFL-FUZZ: Invalid inputs to |timesince and |timeuntil cause an assertion failure
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AFL-FUZZ: Undefined variable input to |wordwrap causes a crash due to a QList.takeFirst() on an empty QList
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AFL-FUZZ: Empty input to |slice filter causes an assertion failure in Qt due to an at(0) call on an empty QString
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AFL-FUZZ: Empty list supplied to |random filter attempts to find element at rand() % 0, generating a CPU arithmetic exception
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AFL-FUZZ: Requesting digit 0 from get_digit filter causes assertion failure due to invalid character offset access in string
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AFL-FUZZ: Accessing variable 'Qt' without a second .-separated component causes a crash due to an attempt to access a list item at a non-existent position
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AFL-FUZZ: Passing a negative integer to |truncatewords causes an illegal list index access
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AFL-FUZZ: Passing a giant integer to |center cause a bad_alloc exception due to excessive memory allocation attempt in left/right string justify routines
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AFL-FUZZ: Trying to apply filters to variable names to be unpacked in a for loop causes a segfault
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AFL-FUZZ: For loop rendering trips a QList assertion when the loop variable list is empty and the 'reversed' keyword is given
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AFL-FUZZ: Parsing large quoted strings causes a stack overflow in the PCRE library (libpcre16.so.3.13.2 on Ubuntu Xenial 16.04.2 LTS; PCRE 8.38)
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