Date: Wed, 18 Sep 2019 09:37:17 +0100 From: Warner Losh <imp@bsdimp.com> To: "Conrad E. Meyer" <cem@freebsd.org> Cc: Toomas Soome <tsoome@freebsd.org>, src-committers <src-committers@freebsd.org>, svn-src-all <svn-src-all@freebsd.org>, svn-src-head <svn-src-head@freebsd.org> Subject: Re: svn commit: r352451 - head/stand/libsa Message-ID: <CANCZdfpa6d2aeGm5cC8DUMCjEVXUwSFST8x70D0tSL5JiTJ6VQ@mail.gmail.com> In-Reply-To: <CAG6CVpW5V7%2BkZZyMBuF_8A3Ns3ETTfaBwqzBqhSq7Ve%2BPJoDJw@mail.gmail.com> References: <201909171616.x8HGGlkb066218@repo.freebsd.org> <CAG6CVpW5V7%2BkZZyMBuF_8A3Ns3ETTfaBwqzBqhSq7Ve%2BPJoDJw@mail.gmail.com>
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On Wed, Sep 18, 2019, 12:18 AM Conrad Meyer <cem@freebsd.org> wrote: > Well, hang on; it's also perfectly legal for a malloc implementation > to return NULL for requests of zero bytes. You can access exactly the > number of bytes requested in the allocation; and free(NULL) works as > expected. NULL (0) is also aligned to any size you could want. > Legal, yes. But it is different than all the other FreeBSD environments, so the loader becomes the odd man out. This restores the consistency. Warner Best, > Conrad > > On Tue, Sep 17, 2019 at 9:16 AM Toomas Soome <tsoome@freebsd.org> wrote: > > > > Author: tsoome > > Date: Tue Sep 17 16:16:46 2019 > > New Revision: 352451 > > URL: https://svnweb.freebsd.org/changeset/base/352451 > > > > Log: > > loader: revert r352421 > > > > As insisted by kib, malloc(0) is quite legal. > > > > Modified: > > head/stand/libsa/zalloc_malloc.c > > > > Modified: head/stand/libsa/zalloc_malloc.c > > > ============================================================================== > > --- head/stand/libsa/zalloc_malloc.c Tue Sep 17 15:53:40 2019 > (r352450) > > +++ head/stand/libsa/zalloc_malloc.c Tue Sep 17 16:16:46 2019 > (r352451) > > @@ -73,9 +73,6 @@ Malloc_align(size_t bytes, size_t alignment) > > { > > Guard *res; > > > > - if (bytes == 0) > > - return (NULL); > > - > > #ifdef USEENDGUARD > > bytes += MALLOCALIGN + 1; > > #else >
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