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b=kW7L4lO01HXn7zgxJsqBLVHcQt12lZAvIVXiAYzB4zZGSSIO0gYr8x4zjaaiRoDwwFoh6etnXBryaajRnj4ZQ+50bPwK85LONd+OxCs6B2HFV1K5tNnjWTFRKLrebWRWVQ3pET1FYPjVkXJYJOGWYNPjNE6dJBi/kLKoCYs+uc0= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from CH2PR12MB4294.namprd12.prod.outlook.com (2603:10b6:610:a9::11) by CY5PR12MB6081.namprd12.prod.outlook.com (2603:10b6:930:2b::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6838.27; Fri, 29 Sep 2023 13:48:49 +0000 Received: from CH2PR12MB4294.namprd12.prod.outlook.com ([fe80::102f:c69b:d3e5:7fe8]) by CH2PR12MB4294.namprd12.prod.outlook.com ([fe80::102f:c69b:d3e5:7fe8%4]) with mapi id 15.20.6838.024; Fri, 29 Sep 2023 13:48:49 +0000 Message-ID: <0eccde0d-6fdd-4351-87c5-930b22ac2d0d@amd.com> Date: Fri, 29 Sep 2023 14:48:43 +0100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] net/tap: resolve stringop-overflow with gcc 12 on ppc64le Content-Language: en-US From: Ferruh Yigit To: Stephen Hemminger Cc: David Christensen , dev@dpdk.org, stable@dpdk.org References: <20230322212439.524725-1-drc@linux.vnet.ibm.com> <20230323170145.129901-1-drc@linux.vnet.ibm.com> <165a233b-b41b-3a65-1866-5b7c94993b40@amd.com> <20230515162032.36a4f3ec@hermes.local> <20230515182838.08e49a7c@hermes.local> <44fb2571-8f96-570d-cb35-210fa5f52d9f@amd.com> Autocrypt: addr=ferruh.yigit@amd.com; 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Is there any disadvantage of this approach? >>> >>> It is already more flexible than the standard ether_aton(). >> >> I mean to accept single chars, as 'tap' currently does, like "a:a:a:a:a:a". >> >> Agree that impact of tap change is small, but if we can eliminate it >> completely without any side affect, why not? >> >> >> As accepting single char will be expanding 'rte_ether_unformat_addr()' >> capability, it will be backward compatible, am I missing anything? >> > > Hi David, > > If API update is not planned, what do you think to just solve the build > error without changing functionality with a change something like below: > > ``` > - (strlen(mac_byte) == strspn(mac_byte, > - ETH_TAP_CMP_MAC_FMT))) { > + (strlen(mac_byte) == strspn(mac_byte, ETH_TAP_CMP_MAC_FMT)) && > + index < RTE_ETHER_ADDR_LEN) { > > ``` Hi David, If you can confirm above fixes the issue, I can send a patch for it.