Hi Bram,

On Sat, Apr 15, 2017 at 6:26 AM, Bram Moolenaar <[email protected]> wrote:
>
> Dominique wrote:
>
>> afl-fuzz found this case which causes use of
>> free memory in vim-8.0563 and older:
>>
>> $ cat bug.vim
>> set efm=E,%W%m,
>> cgetexpr ['C']
>> set efm=%C%m
>> lexpr '0'
>> lopen
>> call setqflist([], 'r')
>> caddbuf
>>
>> $valgrind vim -u NONE -N -S bug.vim 2> vg.log
>>
>> Doing a git bissection, I see that it's
>> a regression introduced by patch 7.4.1980:
>>
>> ===
>> commit 361c8f0e517e41f1f1d34dae328044406fde80ac
>> Author: Bram Moolenaar <[email protected]>
>> Date:   Sat Jul 2 15:41:47 2016 +0200
>>
>>     patch 7.4.1980
>>     Problem:    'errorformat' is parsed for every call to ":caddexpr".
>> Can't add
>>                 to two location lists asynchronously.
>>     Solution:   Keep the previously parsed data when appropriate. (mostly by
>>                 Yegappan Lakshmanan)
>> ===
>
> Thanks.  Looks it happens because of not resetting qf_last.
> I made a patch.
>

I just started looking into this. By that time, you have already
sent out the patch :-).

Thanks,
Yegappan

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