[Nasm-bugs] [Bug 3392846] New: Simple null pointer dereference in nasm (function parse_cmdline)

[noreply-nasm at dev.nasm.us]

https://bugzilla.nasm.us/show_bug.cgi?id=3392846

            Bug ID: 3392846
           Summary: Simple null pointer dereference in nasm (function
                    parse_cmdline)
           Product: NASM
           Version: 2.17 (development)
          Hardware: All
                OS: Linux
            Status: OPEN
          Severity: normal
          Priority: Medium
         Component: Assembler
          Assignee: nobody at nasm.us
          Reporter: youngseok.main at gmail.com
                CC: chang.seok.bae at intel.com, gorcunov at gmail.com,
                    hpa at zytor.com, nasm-bugs at nasm.us
     Obtained from: Built from git using configure

Hello, nasm developers.

Here is another NPD raised by parse_cmdline, found by fuzzing. The command
input is very simple in this case.

Command Input:
nasm --pragma

Output:
nasm: error: option `--pragma' requires an argument

Sanitizer Dump:
==26582==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc
0x5555556853dc bp 0x7fffffffe040 sp 0x7fffffffdf90 T0)
==26582==The signal is caused by a READ memory access.
==26582==Hint: address points to the zero page.
    #0 0x5555556853db in parse_cmdline asm/nasm.c:1492
    #1 0x555555681799 in main asm/nasm.c:554
    #2 0x7ffff6a48c86 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21c86)
    #3 0x55555567f699 in _start
(/home/youngseok/latest-subjects/nasm/nasm+0x12b699)

Environment:
OS: Ubuntu 18.04
gcc: 7.5.0
nasm: 2.17rc0 (Git master branch, a916e4127b2eaa3bf40bddf3de9b0ceefc0d98a)

Note that we built nasm with sanitizers.

Thank you.

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