[konsole] [Bug 494205] New: Crash when sending OSC 4 (RGB) color outside 256 color table

[Luis Bocanegra]

https://bugs.kde.org/show_bug.cgi?id=494205

            Bug ID: 494205
           Summary: Crash when sending OSC 4 (RGB) color outside 256 color
                    table
    Classification: Applications
           Product: konsole
           Version: master
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: emulation
          Assignee: konsole-devel at kde.org
          Reporter: luisbocanegra17b at gmail.com
  Target Milestone: ---

SUMMARY

When setting OSC 4 (RGB) color through escape sequences there doesn't seem to
be a check against out 256 color range. Leading to a crash if some external
software does this, a known example is pywal that has some special escape codes
for some terminal emulators but without a way to check which terminal is a tty
running on (that I know off) they have to send the same escape codes to all of
them. While konsole handles its own color palette it still accepts those codes.

STEPS TO REPRODUCE
1. Put ']4;257;#ff0000\]' in a file and cat it (running it through echo
doesn't seem to work (don't know why) for this so reading from a file/script
that contains the following command is needed.
    echo -n ']4;257;#ff0000\]' >"$(tty)"
2. Close the Konsole tab/split/window

OBSERVED RESULT

Konsole will crash instead of gracefully ending the session

EXPECTED RESULT

Konsole should not crash due to rogue escape sequences

BACKTRACE

I was unable to get a longer one

Thread 1 "konsole" received signal SIGSEGV, Segmentation fault.
QImage::~QImage (this=<optimized out>, this=<optimized out>) at
/usr/src/debug/qt6-base/qtbase/src/gui/image/qimage.cpp:1061
1061        if (d && !d->ref.deref())
(gdb) c
Continuing.
KCrash: Application 'konsole' crashing... crashRecursionCounter = 2

Thread 1 "konsole" received signal SIGSEGV, Segmentation fault.
__pthread_kill_implementation (threadid=<optimized out>, signo=signo at entry=11,
no_tid=no_tid at entry=0) at pthread_kill.c:44
44            return INTERNAL_SYSCALL_ERROR_P (ret) ? INTERNAL_SYSCALL_ERRNO
(ret) : 0;
(gdb) c
Continuing.
Couldn't get registers: No such process.

SOFTWARE/OS VERSIONS

Operating System: Arch Linux 
KDE Plasma Version: 6.2.80
KDE Frameworks Version: 6.7.0
Qt Version: 6.7.3
Kernel Version: 6.11.1-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 12 × Intel® Core™ i7-9750H CPU @ 2.60GHz
Memory: 31.2 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 630

ADDITIONAL INFORMATION

Setting it to -1 instead also crashes but this time right away instead when
closing the session.

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