svn commit: r292410 - head/usr.sbin/boot0cfg
John Baldwin
jhb at freebsd.org
Fri Dec 18 19:50:11 UTC 2015
On Friday, December 18, 2015 02:17:16 PM Marcelo Araujo wrote:
> 2015-12-18 13:53 GMT+08:00 Garrett Cooper <yaneurabeya at gmail.com>:
>
> >
> > > On Dec 17, 2015, at 21:36, luke <luke.tw at gmail.com> wrote:
> > >
> > >> On Fri, Dec 18, 2015 at 4:42 AM, John Baldwin <jhb at freebsd.org> wrote:
> > >> Author: jhb
> > >> Date: Thu Dec 17 20:42:05 2015
> > >> New Revision: 292410
> > >> URL: https://svnweb.freebsd.org/changeset/base/292410
> > >>
> > >> Log:
> > >> Exit cleanly if malloc() fails to allocate a buffer for a copy of the
> > >> current MBR.
> > >>
> > >> PR: 205322
> > >> Submitted by: Alexander Kuleshov <kuleshovmail at gmail.com>
> > >> MFC after: 1 week
> > >>
> > >> Modified:
> > >> head/usr.sbin/boot0cfg/boot0cfg.c
> > >>
> > >> Modified: head/usr.sbin/boot0cfg/boot0cfg.c
> > >>
> > ==============================================================================
> > >> --- head/usr.sbin/boot0cfg/boot0cfg.c Thu Dec 17 20:33:20 2015
> > (r292409)
> > >> +++ head/usr.sbin/boot0cfg/boot0cfg.c Thu Dec 17 20:42:05 2015
> > (r292410)
> > >> @@ -337,6 +337,8 @@ read_mbr(const char *disk, u_int8_t **mb
> > >> return (mbr_size);
> > >> }
> > >> *mbr = malloc(sizeof(buf));
> > >> + if (mbr == NULL)
> > >> + errx(1, "%s: unable to allocate MBR buffer", disk);
> > >> memcpy(*mbr, buf, sizeof(buf));
> > >> close(fd);
> >
> >
> > > Hi,
> > >
> > > Should the check be against *mbr ?
> > > + if (*mbr == NULL)
> > > + errx(1, "%s: unable to allocate MBR buffer", disk);
> >
> > Yup!
> >
>
> +1
>
> Could be write as:
> if ((*mbr = malloc(sizeof(buf))) == NULL)
> errx(1, "%s: unable to allocate MBR buffer", disk);
Yes, but I don't like side effects in conditionals.
OTOH, changing away from that is how I fubar'd the original patch. :-/
--
John Baldwin
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