From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932253Ab3KMPu0 (ORCPT ); Wed, 13 Nov 2013 10:50:26 -0500 Received: from arkanian.console-pimps.org ([212.110.184.194]:32821 "EHLO arkanian.console-pimps.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756789Ab3KMPuV (ORCPT ); Wed, 13 Nov 2013 10:50:21 -0500 Date: Wed, 13 Nov 2013 15:50:17 +0000 From: Matt Fleming To: dyoung@redhat.com Cc: linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org, x86@kernel.org, mjg59@srcf.ucam.org, hpa@zytor.com, James.Bottomley@HansenPartnership.com, vgoyal@redhat.com, ebiederm@xmission.com, horms@verge.net.au, kexec@lists.infradead.org, bp@alien8.de Subject: Re: [patch 3/7 v2] Cleanup efi_enter_virtual_mode function Message-ID: <20131113155017.GB17248@console-pimps.org> References: <20131105082007.872550445@dhcp-16-126.nay.redhat.com> <20131105082716.825753041@dhcp-16-126.nay.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131105082716.825753041@dhcp-16-126.nay.redhat.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 05 Nov, at 04:20:10PM, dyoung@redhat.com wrote: > Add two small functions: > efi_merge_regions and efi_map_regions, efi_enter_virtual_mode > calls them instead of embedding two long for loop. > > v1->v2: > refresh; coding style fixes. > > Signed-off-by: Dave Young > --- > arch/x86/platform/efi/efi.c | 107 +++++++++++++++++++++++++------------------- > 1 file changed, 63 insertions(+), 44 deletions(-) [...] > @@ -860,17 +840,59 @@ void __init efi_enter_virtual_mode(void) > efi.systab = (efi_system_table_t *) (unsigned long) systab; > } > > - new_memmap = krealloc(new_memmap, > - (count + 1) * memmap.desc_size, > - GFP_KERNEL); > - if (!new_memmap) > + *new_memmap = krealloc(*new_memmap, > + (*count + 1) * memmap.desc_size, > + GFP_KERNEL); > + if (!*new_memmap) > goto err_out; > > - memcpy(new_memmap + (count * memmap.desc_size), md, > + memcpy(*new_memmap + (*count * memmap.desc_size), md, > memmap.desc_size); > - count++; > + (*count)++; > } > > +err_out: > + pr_err("Error reallocating memory, EFI runtime non-functional!\n"); > +} You should really return an error value here so that we don't dereference 'new_memmap' below if it's NULL. In fact, just return the memmap... > + > + efi_merge_regions(); > + > + efi_map_regions(&new_memmap, &count); > + and make sure to check the return value here. -- Matt Fleming, Intel Open Source Technology Center