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Thu, 14 Jul 2022 14:38:08 +0000 From: Darren Kenny To: Ross Philipson , grub-devel@gnu.org Cc: daniel.kiper@oracle.com, ross.philipson@oracle.com, alec.r.brown@oracle.com, jag.raman@oracle.com Subject: Re: [PATCH] Initialize local relocator subchunk struct to all zeros In-Reply-To: <1657806088-4908-1-git-send-email-ross.philipson@oracle.com> References: <1657806088-4908-1-git-send-email-ross.philipson@oracle.com> Date: Thu, 14 Jul 2022 15:38:04 +0100 Message-ID: Content-Type: text/plain X-ClientProxiedBy: DBBPR09CA0025.eurprd09.prod.outlook.com (2603:10a6:10:d4::13) To BLAPR10MB5138.namprd10.prod.outlook.com (2603:10b6:208:322::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 34146b28-4f73-4d22-9005-08da65a67842 X-MS-TrafficTypeDiagnostic: BYAPR10MB3685:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; 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envelope-from=darren.kenny@oracle.com; helo=mx0a-00069f02.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: grub-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: The development of GNU GRUB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Jul 2022 14:38:20 -0000 Hi Ross, This looks good to me. On Thursday, 2022-07-14 at 09:41:28 -04, Ross Philipson wrote: > The way the code is written the tofree variable would never be > passed to the free_subchunk() function uninitialized. Coverity > cannot determine this and flags the situation as "Using uninitialized > value...". The fix is just to initialize the local struct. > > Fixes: CID 314016 > > Signed-off-by: Ross Philipson Reviewed-by: Darren Kenny Thanks, Darren. > --- > grub-core/lib/relocator.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/grub-core/lib/relocator.c b/grub-core/lib/relocator.c > index 68ef128..bfcc70d 100644 > --- a/grub-core/lib/relocator.c > +++ b/grub-core/lib/relocator.c > @@ -989,7 +989,7 @@ malloc_in_range (struct grub_relocator *rel, > if (j != 0 && events[j - 1].pos != events[j].pos) > { > grub_addr_t alloc_start, alloc_end; > - struct grub_relocator_subchunk tofree; > + struct grub_relocator_subchunk tofree = {0}; > struct grub_relocator_subchunk *curschu = &tofree; > if (!oom) > curschu = &res->subchunks[cural]; > -- > 1.8.3.1