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([10.237.72.28]) by orviesa001.jf.intel.com with ESMTP; 16 Aug 2024 06:59:06 -0700 From: Heikki Krogerus To: Greg Kroah-Hartman Cc: Jameson Thies , Benson Leung , Prashant Malani , Dmitry Baryshkov , linux-usb@vger.kernel.org, "Pilla, Siva sai kumar" , Abhishek Pandit-Subedi , Bartosz Szpila Subject: [PATCH v2 2/6] usb: typec: ucsi: Don't truncate the reads Date: Fri, 16 Aug 2024 16:58:55 +0300 Message-ID: <20240816135859.3499351-3-heikki.krogerus@linux.intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240816135859.3499351-1-heikki.krogerus@linux.intel.com> References: <20240816135859.3499351-1-heikki.krogerus@linux.intel.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 That may silently corrupt the data. Instead, failing attempts to read more than the interface can handle. Signed-off-by: Heikki Krogerus --- drivers/usb/typec/ucsi/ucsi.c | 8 ++------ drivers/usb/typec/ucsi/ucsi.h | 2 ++ 2 files changed, 4 insertions(+), 6 deletions(-) diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c index 4039851551c1..96ef099a6f84 100644 --- a/drivers/usb/typec/ucsi/ucsi.c +++ b/drivers/usb/typec/ucsi/ucsi.c @@ -99,12 +99,8 @@ static int ucsi_run_command(struct ucsi *ucsi, u64 command, u32 *cci, *cci = 0; - /* - * Below UCSI 2.0, MESSAGE_IN was limited to 16 bytes. Truncate the - * reads here. - */ - if (ucsi->version <= UCSI_VERSION_1_2) - size = clamp(size, 0, 16); + if (size > UCSI_MAX_DATA_LENGTH(ucsi)) + return -EINVAL; ret = ucsi->ops->sync_control(ucsi, command); if (ret) diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h index 7bc132b59027..5e3c6cb822c8 100644 --- a/drivers/usb/typec/ucsi/ucsi.h +++ b/drivers/usb/typec/ucsi/ucsi.h @@ -412,6 +412,8 @@ struct ucsi { #define UCSI_DELAY_DEVICE_PDOS BIT(1) /* Reading PDOs fails until the parter is in PD mode */ }; +#define UCSI_MAX_DATA_LENGTH(u) (((u)->version < UCSI_VERSION_2_0) ? 0x10 : 0xff) + #define UCSI_MAX_SVID 5 #define UCSI_MAX_ALTMODES (UCSI_MAX_SVID * 6)