[Bug gas/20904] New: AS: Assertion violation when handling whitespaces in expressions

[boehme.marcel at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20904

            Bug ID: 20904
           Summary: AS: Assertion violation when handling whitespaces in
                    expressions
           Product: binutils
           Version: 2.28 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: boehme.marcel at gmail dot com
  Target Milestone: ---

Dear all,

The following bug was found with AFLFast, a fork of AFL, in a 24 hour fuzzing
session on Binutils. Thanks also to Van-Thuan Pham.

The assembler fails with an assertion violation for the following execution on
Ubuntu 16.04 x86_64 and 14.04 x86_64 for Binutils v2.26.1 and trunk. It works
fine for v2.24:

$ printf "\"\x00.=&%%/  0" > test
$ ./as test
test: Assembler messages:
test: Warning: end of file in string; '"' inserted
test:1: Warning: missing closing '"'
test:1: Error: expecting mnemonic; got nothing
test:1: Internal error!
Assertion failure in operand at expr.c:1375.
Please report this bug.

SKIP_WHITESPACE really skips only one space-character, so that the next
character can indeed be another space-character.

Best regards,
- Marcel

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