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bug#25684: 25.1; (downcase -1) segfaults Emacs on GNU/Linux
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From: |
Andreas Schwab |
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Subject: |
bug#25684: 25.1; (downcase -1) segfaults Emacs on GNU/Linux |
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Date: |
Tue, 14 Feb 2017 16:04:24 +0100 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux) |
On Feb 13 2017, Glenn Morris <rgm@gnu.org> wrote:
> Wilfred Hughes wrote:
>
>> The elisp primitives downcase and upcase cause Emacs to segfault when
>> given a negative argument. For example, (downcase -1).
>>
>> I can reproduce this on Emacs 25.1 as well as on master. It occurs on
>> GNU/Linux but not on OS X.
>
> I can't reproduce this, but it seems to me that (downcase -1) should
> signal a wrong-type-argument error, since negative numbers are not characters.
> But I think there are probably subtleties here that I don't get.
The function uses XFASTINT, which only works for non-negative numbers.
This is checked when runtime checking is enabled.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
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