[llvm-bugs] [Bug 28488] New: llvm-mc crashes with invalid output-asm-variant

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28488

            Bug ID: 28488
           Summary: llvm-mc crashes with invalid output-asm-variant
           Product: libraries
           Version: 3.8
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: MC
          Assignee: unassignedbugs at nondot.org
          Reporter: jvoss+bugs at altsci.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Giving an invalid value to output-asm-variant causes llvm-mc to crash
dereferencing a null pointer.

echo '0xb0 0x0b' | llvm-mc --disassemble -triple=x86_64 --output-asm-variant=2
#0 0x00007ff528254708 llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/usr/bin/../lib64/libLLVMSupport.so.3.8+0xcd708)
#1 0x00007ff5282526f6 llvm::sys::RunSignalHandlers()
(/usr/bin/../lib64/libLLVMSupport.so.3.8+0xcb6f6)
#2 0x00007ff5282529cb (/usr/bin/../lib64/libLLVMSupport.so.3.8+0xcb9cb)
#3 0x00007ff5278f9160 (/lib64/libc.so.6+0x33160)
#4 0x000000000040987d _init (/usr/bin/llvm-mc+0x40987d)
#5 0x00007ff5278e6790 __libc_start_main (/lib64/libc.so.6+0x20790)
#6 0x000000000040a429 _init (/usr/bin/llvm-mc+0x40a429)
Stack dump:
0.      Program arguments: llvm-mc --disassemble -triple=x86_64
--output-asm-variant=2 
Segmentation fault

gdb llvm-mc

(gdb) run --disassemble -triple=x86_64 --output-asm-variant=2
0xb0 0x0b

Program received signal SIGSEGV, Segmentation fault.
0x000000000040987d in main ()
(gdb) bt
#0  0x000000000040987d in main ()
(gdb) disassemble
...
=> 0x000000000040987d <+7005>:  mov    %al,0x29(%rdx)

(gdb) i r
...
rdx            0x0      0

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