[Nasm-bugs] [Bug 3392516] New: Malformed input file results in segmentation fault of NASM

noreply-nasm at gorcunov.org noreply-nasm at gorcunov.org
Mon Sep 10 11:49:10 PDT 2018


            Bug ID: 3392516
           Summary: Malformed input file results in segmentation fault of
           Product: NASM
           Version: 2.14 (development)
          Hardware: All
                OS: All
            Status: OPEN
          Severity: normal
          Priority: Medium
         Component: Assembler
          Assignee: nobody at nasm.us
          Reporter: j.zebor at f5.com
                CC: gorcunov at gmail.com, hpa at zytor.com, nasm-bugs at nasm.us
     Obtained from: Build from source archive using configure

Created attachment 411670
  --> https://bugzilla.nasm.us/attachment.cgi?id=411670&action=edit
Malformed input file

Attached case is a file which results in a very similar case as reported in
bugs 3392447 & 3392329.

There are two differences with this finding that I've observed:
- Both 3392447 & 3392329 only reproduced for me with ASAN enabled. The attached
file can reproduce the issue without ASAN.
- The value of "value->type" in the attached case results in a very large
negative number in parse_line function.

This bug was found with American Fuzzy LOP.

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