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[80.56.140.230]) by smtp.gmail.com with ESMTPSA id w15sm2363991pfu.11.2022.01.26.05.44.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Jan 2022 05:44:23 -0800 (PST) Message-ID: <84c2e35f-ec6a-93ee-0bca-f8ed535bc3f2@broadcom.com> Date: Wed, 26 Jan 2022 14:44:15 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH] brcmfmac: Fix a NULL pointer dereference in brcmf_of_probe() To: Zhou Qingyang Cc: kjlu@umn.edu, Arend van Spriel , Franky Lin , Hante Meuleman , Chi-hsien Lin , Wright Feng , Chung-hsien Hsu , Kalle Valo , "David S. Miller" , Jakub Kicinski , Len Baker , "Gustavo A. R. Silva" , Shawn Guo , Hans deGoede , Matthias Brugger , linux-wireless@vger.kernel.org, brcm80211-dev-list.pdl@broadcom.com, SHA-cyfmac-dev-list@infineon.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <20220124165048.54677-1-zhou1615@umn.edu> From: Arend van Spriel In-Reply-To: <20220124165048.54677-1-zhou1615@umn.edu> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000005f404205d67c66c4" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --0000000000005f404205d67c66c4 Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 1/24/2022 5:50 PM, 'Zhou Qingyang' via BRCM80211-DEV-LIST,PDL wrote: > In brcmf_of_probe(), the return value of devm_kzalloc() is assigned to > board_type and there is a dereference of it in strcpy() right after > that. devm_kzalloc() could return NULL on failure of allocation, which > could lead to NULL pointer dereference. > > Fix this bug by adding a NULL check of board_type. > > This bug was found by a static analyzer. > > Builds with 'make allyesconfig' show no new warnings, > and our static analyzer no longer warns about this code Thanks for this suggestion. However, this has been addressed already by this patch [1]. Regards, Arend [1] https://patchwork.kernel.org/project/linux-wireless/patch/20220117142919.207370-8-marcan@marcan.st/ --0000000000005f404205d67c66c4 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQdwYJKoZIhvcNAQcCoIIQaDCCEGQCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3OMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t rVWO/EiXfYnK7zeop26ry1RpKtogB7/O115zultAz64ydQYLe+a1e/czkALg3sgTcOOcFZTXk38e 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