[luatex] Segmentation fault in 1.09.2

[Henri Menke]

On 1/17/19 6:58 PM, luigi scarso wrote:
> On Wed, Jan 16, 2019 at 11:04 PM Henri Menke <henrimenke at gmail.com> wrote:
> 
>> The fix is pretty easy, there was only an uninitialized string
>> somewhere.  Patch is attached.
>>
>> On 16/01/19 10:51 PM, luigi scarso wrote:
>> > On Wed, Jan 16, 2019 at 10:45 AM Henri Menke <henrimenke at gmail.com>
>> wrote:
>> >
>> >> I have prepared a plain example (attached) which can be run with
>> >>
>> >>     mtxrun --script plain --run test.tex
>> >>
>> >> and also segfaults.
>> >>
>> >> On 1/16/19 10:14 PM, Henri Menke wrote:
>> >>> Dear list,
>> >>>
>> >>> To answer a question on TeX.SX I wanted to compare glyph sidebearings
>> >>> using kerns.  However, when trying to insert a kern before the head of
>> >>> the last line I first get an error followed by segmentation fault:
>> >>>
>> >>> warning  (node filter): error: [\directlua]:12: Attempt to
>> >>> node.insert_before() a non-existing node
>> >>>
>> >>> Segmentation fault
>> >>>
>> >>> The example is attached because it's a bit larger.  I marked the
>> >>> offending line with “BOOM”.
>> >>>
>> >>> Cheers, Henri
>> >>>
>> >>
>> >>
>> > Thank you very much for the report, we will see it asap.
>> >
>>
> 
> $ cat test-053.c
> /*test-053.c */
> int main(void)
> {
>   char *a ="";
>   (void)a;
>   return 0;
> 
> }
> $ gcc  -Wall -Wextra -Wunused -Wimplicit -Wreturn-type
> -Wdeclaration-after-statement -Wno-unknown-pragmas -Wmissing-prototypes
> -Wmissing-declarations -Wparentheses -Wswitch -Wtrigraphs -Wpointer-arith
> -Wcast-qual -Wcast-align -Wwrite-strings -Wold-style-definition
>  test-053.c -o test-053
> test-053.c: In function ‘main’:
> test-053.c:4:12: warning: initialization discards ‘const’ qualifier from
> pointer target type [-Wdiscarded-qualifiers]
>    char *a ="";
> 
> hm.
> 

In C nothing is really const, but fair enough.  Maybe the attached patch
is better.


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