Re: mandoc -Thtml crashing for certain inputs

[Ingo Schwarze <schwarze@usta.de>]

Hi Abhinav,

Abhinav Upadhyay wrote on Sat, May 13, 2017 at 06:36:53PM +0530:

> mandoc -Thtml seems to be crashing in some cases, when you pass the
> -Ostyle option to it, such as `mandoc -Thtml -Ostyle=s/style.css'.
> 
>  The core indicates a null pointer dereference at line 754 in
> mdoc_html.c (1.14.1 release):
> 
> if (h->style != NULL && !bl->norm->Bl.comp &&
>      (n->parent->prev == NULL ||
>       n->parent->prev->body->child != NULL)) {
> ...
> 
> I am able to hit it with the following test case:
> 
> .Dd May 13, 2017
> .Dt FOO 8
> .Os
> .Sh NAME
> .Nm foo
> .Nd man page for foo
> .Sh DESCRIPTION
> foo bar
> .Bl -tag -width Ds
> .Sm off
> .It Ar device
> Open the specified device
> .El
> 
> It crashes because of the presence of `.Sm off' inside the list. The
> actual issue was happening while generating html for the rmt(8) man
> page from FreeBSD-12.0-current but I tried to reduce it down to a
> smaller test case for ease of debugging.

That crash was first reported by Gabriel Guzman and i fixed it
in mdoc_html.c rev. 1.272 on Feb 22, 2017.  The HEAD revision
of that file currently is rev. 1.287.

Yours,
  Ingo
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