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[79.43.11.75]) by smtp.gmail.com with ESMTPSA id ay17-20020a170906d29100b006e88f246fdbsm1319695ejb.152.2022.04.14.23.06.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Apr 2022 23:06:19 -0700 (PDT) From: "Fabio M. De Francesco" To: Greg Kroah-Hartman , Haowen Bai Cc: Haowen Bai , linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH V3] staging: rtl8192e: Fix signedness bug in rtllib_rx_assoc_resp() Date: Fri, 15 Apr 2022 08:06:17 +0200 Message-ID: <16182197.geO5KgaWL5@leap> In-Reply-To: <1650001836-25956-1-git-send-email-baihaowen@meizu.com> References: <20220415053116.GN3293@kadam> <1650001836-25956-1-git-send-email-baihaowen@meizu.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="ISO-8859-1" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On venerd=EC 15 aprile 2022 07:50:36 CEST Haowen Bai wrote: > The rtllib_rx_assoc_resp() function has a signedness bug because it's > a declared as a u16 but it return -ENOMEM. When you look at it more > closely it returns a mix of error codes including 0xcafe, -ENOMEM, and > a->status which is WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG. This is a mess. >=20 > Clean it up to just return standard kernel error codes. We can print > out the a->status before returning a regular error code. The printks > in the caller need to be adjusted as well. This commit message suggested by Dan Carpenter is much better. The previous= =20 one made me think that you were doing several different logical changes. > > [snip] > =20 > static void rtllib_rx_auth_resp(struct rtllib_device *ieee, struct=20 sk_buff *skb) > { > - u16 errcode; > + int errcode; > u8 *challenge; > int chlen =3D 0; > bool bSupportNmode =3D true, bHalfSupportNmode =3D false; > @@ -2292,8 +2292,8 @@ static void rtllib_rx_auth_resp(struct=20 rtllib_device *ieee, struct sk_buff *skb) > if (errcode) { > ieee->softmac_stats.rx_auth_rs_err++; > netdev_info(ieee->dev, > - "Authentication response status code=20 0x%x", > - errcode); > + "Authentication response status code %d", > + le16_to_cpu(errcode)); This is something that I'm still missing. Why do we need that call to=20 le16_to_cpu on "errcode"? "errcode" is returned by auth_parse()? I see that this function already=20 changes the endianness of the returned value. Thanks, =46abio > rtllib_associate_abort(ieee); > return; > } > --=20 > 2.7.4 >=20 >=20 >=20