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[89.109.50.74]) by smtp.gmail.com with ESMTPSA id v6-20020a2e9246000000b0029ee7bc0114sm2248537ljg.64.2023.04.17.12.50.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Apr 2023 12:50:41 -0700 (PDT) From: Maxim Korotkov To: Heikki Krogerus Cc: Maxim Korotkov , Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, lvc-project@linuxtesting.org Subject: [PATCH] usb: typec: fix potential NULL dereference Date: Mon, 17 Apr 2023 22:50:03 +0300 Message-Id: <20230417195003.19504-1-korotkov.maxim.s@gmail.com> X-Mailer: git-send-email 2.37.2 MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1763455709179126579?= X-GMAIL-MSGID: =?utf-8?q?1763455709179126579?= The pointer 'adev' was being dereferenced before being checked for NULL in the 'type_alt mode_enter()' and 'type_alt mode_exit()' functions. Although this is a hypothetical issue, it's better to move the pointer assignment after the NULL check to avoid any potential problems. Found by Linux Verification Center with Svace static analyzer. Fixes: 8a37d87d72f0 ("usb: typec: Bus type for alternate modes") Signed-off-by: Maxim Korotkov --- drivers/usb/typec/bus.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/usb/typec/bus.c b/drivers/usb/typec/bus.c index 098f0efaa58d..ae0aca8f33db 100644 --- a/drivers/usb/typec/bus.c +++ b/drivers/usb/typec/bus.c @@ -125,13 +125,16 @@ EXPORT_SYMBOL_GPL(typec_altmode_notify); */ int typec_altmode_enter(struct typec_altmode *adev, u32 *vdo) { - struct altmode *partner = to_altmode(adev)->partner; - struct typec_altmode *pdev = &partner->adev; + struct altmode *partner; + struct typec_altmode *pdev; int ret; if (!adev || adev->active) return 0; + partner = to_altmode(adev)->partner; + pdev = &partner->adev; + if (!pdev->ops || !pdev->ops->enter) return -EOPNOTSUPP; @@ -156,13 +159,15 @@ EXPORT_SYMBOL_GPL(typec_altmode_enter); */ int typec_altmode_exit(struct typec_altmode *adev) { - struct altmode *partner = to_altmode(adev)->partner; - struct typec_altmode *pdev = &partner->adev; + struct altmode *partner; + struct typec_altmode *pdev; int ret; if (!adev || !adev->active) return 0; + partner = to_altmode(adev)->partner; + pdev = &partner->adev; if (!pdev->ops || !pdev->ops->exit) return -EOPNOTSUPP;