Date: Thu, 12 Jul 2001 07:37:37 -0700 From: Mark Peek <mark@whistle.com> To: freebsd-questions@FreeBSD.ORG, stable@FreeBSD.ORG Subject: Re: cron exited on signal 11 Message-ID: <p05100300b773635956ee@[207.76.207.129]> In-Reply-To: <200107120602.f6C628T41618@earth.backplane.com> References: <1399129667.20010709164730@mail.ru> <006e01c10927$c3151d80$6d36120a@comsys.ntukpi.kiev.ua> <18810557330.20010711121320@mail.ru> <86itgz4eyf.fsf@hades.hell.gr> <20010711224709.11607.qmail@panda.freebsdsystems.com> <p0510032cb772c6d1161d@[207.76.207.129]> <200107120602.f6C628T41618@earth.backplane.com>
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At 11:02 PM -0700 7/11/01, Matt Dillon wrote:
> Well this certainly opens up a can of worms! Not your patch, but what
> it implies. For example, env_set() assumes envp is not NULL as well.
> In fact, most of the code assumes envp is not NULL, and 99% of the time
> that is true due to the env_init() calls.
>
> I found at least one case in the code where free_entry() is called with
> e->envp == NULL. Perhaps a more correct fix would simply be to have
> free_entry() check for e->envp != NULL before calling env_free() rather
> then having env_free() check for NULL.
>
> It would be great if the original poster could try this patch rather
> then the above patch to see if it also fixes the problem.
>
> -Matt
>
>Index: lib/entry.c
>===================================================================
>RCS file: /home/ncvs/src/usr.sbin/cron/lib/entry.c,v
>retrieving revision 1.12
>diff -u -r1.12 entry.c
>--- lib/entry.c 2001/06/13 05:49:37 1.12
>+++ lib/entry.c 2001/07/12 05:59:54
>@@ -74,7 +74,8 @@
> free(e->class);
> #endif
> free(e->cmd);
>- env_free(e->envp);
>+ if (e->envp != NULL)
>+ env_free(e->envp);
> free(e);
> }
Matt,
I see your point about env_set() and env_free() being orthogonal wrt
envp != NULL. I also contemplated making the same change you made
above. However, I thought it was better to have free() style
semantics and allow env_free() to properly handle a NULL pointer.
("Be liberal in what you accept...")
Mark
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