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Details

Type: Bug
Resolution: Done
Priority: P2: Important
Fix Version/s: 6.0.1
Affects Version/s: 5.15.2
Component/s: Core: Date/Time
Labels:
- found_by_libfuzzer
Environment:
Ubuntu 20.04 LTS 64 bit

Description

Configure Qt with:

-sanitize fuzzer-no-link -sanitize undefined

Build Qt.
Use this Qt build to build your fuzz target for QDateTime.

Let it run on the attached input file.

./fromstring input

You will see output like:

INFO: Seed: 1937882766
INFO: Loaded 1 modules   (251117 inline 8-bit counters): 251117 [0x13a1e28, 0x13df315), 
INFO: Loaded 1 PC tables (251117 PCs): 251117 [0x13df318,0x17b41e8), 
./fromstring: Running 1 inputs 1 time(s) each.
Running: freshcorpus/039ae44bd8458eef04527ce989e0d427d7cb9248
/home/qtrob/dev/src/qt-5.15.2-base_svg/qtbase/src/corelib/time/qcalendarmath_p.h:68:13: runtime error: signed integer overflow: -9223372036854775808 - 6 cannot be represented in type 'long long'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/qtrob/dev/src/qt-5.15.2-base_svg/qtbase/src/corelib/time/qcalendarmath_p.h:68:13 in 
/home/qtrob/dev/src/qt-5.15.2-base_svg/qtbase/src/corelib/time/qcalendarmath_p.h:71:12: runtime error: signed integer overflow: -9223372036854775808 - 9223372036854775800 cannot be represented in type 'long long'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/qtrob/dev/src/qt-5.15.2-base_svg/qtbase/src/corelib/time/qcalendarmath_p.h:71:12 in 
Executed freshcorpus/039ae44bd8458eef04527ce989e0d427d7cb9248 in 7 ms
***
*** NOTE: fuzzing was not performed, you have only
***       executed the target code on a fixed set of inputs.
***