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AJvYcCVzE/rrfzi+5gXaDCQs4fzi86ptNDai41VdqkX3H4OUhUvKhhj0JOocjcpijnlHXbA5MNn2v/uI85fI76y2ZGDp71GppNXHrzt+ X-Gm-Message-State: AOJu0YwpSlMdnhIZA64Fumc7pEgb/wIpkdP+Kt7rpZKuA36nOttO4PT5 p/8QVlRnXPgqJjaufQD7kNhSM38CFX3a9APhHCukfJoMdvrrSY3hqdUClE6rQg5+Uh/IrtuW5F6 hYA== X-Google-Smtp-Source: AGHT+IH0Hl7sTOqR41zDK1Dxc6Amfcy0YB0Fkd2Xj5M07oxreTYb6CYyg15guWzK5gZbo9fvojMWUZHuFdk= X-Received: from jthies.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:23db]) (user=jthies job=sendgmr) by 2002:a05:690c:6202:b0:611:5a9d:bb0e with SMTP id 00721157ae682-622af90c63bmr9600407b3.4.1715366617882; Fri, 10 May 2024 11:43:37 -0700 (PDT) Date: Fri, 10 May 2024 18:43:21 +0000 In-Reply-To: <20240510184324.2944101-1-jthies@google.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240510184324.2944101-1-jthies@google.com> X-Mailer: git-send-email 2.45.0.118.g7fe29c98d7-goog Message-ID: <20240510184324.2944101-2-jthies@google.com> Subject: [PATCH v4 1/4] usb: typec: ucsi: Fix null pointer dereference in trace From: Jameson Thies To: heikki.krogerus@linux.intel.com, linux-usb@vger.kernel.org Cc: jthies@google.com, pmalani@chromium.org, bleung@google.com, abhishekpandit@chromium.org, andersson@kernel.org, dmitry.baryshkov@linaro.org, fabrice.gasnier@foss.st.com, gregkh@linuxfoundation.org, hdegoede@redhat.com, neil.armstrong@linaro.org, rajaram.regupathy@intel.com, saranya.gopal@intel.com, linux-kernel@vger.kernel.org, Benson Leung From: Abhishek Pandit-Subedi ucsi_register_altmode checks IS_ERR for the alt pointer and treats NULL as valid. When CONFIG_TYPEC_DP_ALTMODE is not enabled, ucsi_register_displayport returns NULL which causes a NULL pointer dereference in trace. Rather than return NULL, call typec_port_register_altmode to register DisplayPort alternate mode as a non-controllable mode when CONFIG_TYPEC_DP_ALTMODE is not enabled. Reviewed-by: Benson Leung Reviewed-by: Heikki Krogerus Signed-off-by: Jameson Thies Signed-off-by: Abhishek Pandit-Subedi --- Changes in V4: - Updated commit message. Changes in V3: - Returns typec_port_register_altmode call from ucsi_register_displayport when CONFIG_TYPEC_DP_ALTMODE is not enabled. Updated commit message. Changes in V2: - Checks for error response from ucsi_register_displayport when registering DisplayPort alternate mode. drivers/usb/typec/ucsi/ucsi.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h index c4d103db9d0f8..f66224a270bc6 100644 --- a/drivers/usb/typec/ucsi/ucsi.h +++ b/drivers/usb/typec/ucsi/ucsi.h @@ -496,7 +496,7 @@ ucsi_register_displayport(struct ucsi_connector *con, bool override, int offset, struct typec_altmode_desc *desc) { - return NULL; + return typec_port_register_altmode(con->port, desc); } static inline void