From: Amit Sunil Dhamne amitsd@google.com
Register read of TCPC_RX_BYTE_CNT returns the total size consisting of:
PD message (pending read) size + 1 Byte for Frame Type (SOP*)
This is validated against the max PD message (`struct pd_message`) size without accounting for the extra byte for the frame type. Note that the struct pd_message does not contain a field for the frame_type. This results in false negatives when the "PD message (pending read)" is equal to the max PD message size.
Fixes: 6f413b559f86 ("usb: typec: tcpci_maxim: Chip level TCPC driver") Signed-off-by: Amit Sunil Dhamne amitsd@google.com Signed-off-by: Badhri Jagan Sridharan badhri@google.com Reviewed-by: Kyle Tso kyletso@google.com --- drivers/usb/typec/tcpm/tcpci_maxim_core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/typec/tcpm/tcpci_maxim_core.c b/drivers/usb/typec/tcpm/tcpci_maxim_core.c index fd1b80593367641a6f997da2fb97a2b7238f6982..648311f5e3cf135f23b5cc0668001d2f177b9edd 100644 --- a/drivers/usb/typec/tcpm/tcpci_maxim_core.c +++ b/drivers/usb/typec/tcpm/tcpci_maxim_core.c @@ -166,7 +166,8 @@ static void process_rx(struct max_tcpci_chip *chip, u16 status) return; }
- if (count > sizeof(struct pd_message) || count + 1 > TCPC_RECEIVE_BUFFER_LEN) { + if (count > sizeof(struct pd_message) + 1 || + count + 1 > TCPC_RECEIVE_BUFFER_LEN) { dev_err(chip->dev, "Invalid TCPC_RX_BYTE_CNT %d\n", count); return; }
--- base-commit: ebd297a2affadb6f6f4d2e5d975c1eda18ac762d change-id: 20250421-b4-new-fix-pd-rx-count-79297ba619b7
Best regards,
Hi,
Thanks for your patch.
FYI: kernel test robot notices the stable kernel rule is not satisfied.
The check is based on https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html#opti...
Rule: add the tag "Cc: stable@vger.kernel.org" in the sign-off area to have the patch automatically included in the stable tree. Subject: [PATCH] usb: typec: tcpm/tcpci_maxim: Fix bounds check in process_rx() Link: https://lore.kernel.org/stable/20250502-b4-new-fix-pd-rx-count-v1-1-e5711ed0...
On Fri, May 02, 2025 at 04:57:03PM -0700, Amit Sunil Dhamne via B4 Relay wrote:
From: Amit Sunil Dhamne amitsd@google.com
Register read of TCPC_RX_BYTE_CNT returns the total size consisting of:
PD message (pending read) size + 1 Byte for Frame Type (SOP*)
This is validated against the max PD message (`struct pd_message`) size without accounting for the extra byte for the frame type. Note that the struct pd_message does not contain a field for the frame_type. This results in false negatives when the "PD message (pending read)" is equal to the max PD message size.
Fixes: 6f413b559f86 ("usb: typec: tcpci_maxim: Chip level TCPC driver") Signed-off-by: Amit Sunil Dhamne amitsd@google.com Signed-off-by: Badhri Jagan Sridharan badhri@google.com Reviewed-by: Kyle Tso kyletso@google.com
Reviewed-by: Heikki Krogerus heikki.krogerus@linux.intel.com
drivers/usb/typec/tcpm/tcpci_maxim_core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/typec/tcpm/tcpci_maxim_core.c b/drivers/usb/typec/tcpm/tcpci_maxim_core.c index fd1b80593367641a6f997da2fb97a2b7238f6982..648311f5e3cf135f23b5cc0668001d2f177b9edd 100644 --- a/drivers/usb/typec/tcpm/tcpci_maxim_core.c +++ b/drivers/usb/typec/tcpm/tcpci_maxim_core.c @@ -166,7 +166,8 @@ static void process_rx(struct max_tcpci_chip *chip, u16 status) return; }
- if (count > sizeof(struct pd_message) || count + 1 > TCPC_RECEIVE_BUFFER_LEN) {
- if (count > sizeof(struct pd_message) + 1 ||
count + 1 > TCPC_RECEIVE_BUFFER_LEN) {
base-commit: ebd297a2affadb6f6f4d2e5d975c1eda18ac762d change-id: 20250421-b4-new-fix-pd-rx-count-79297ba619b7
Best regards,
Amit Sunil Dhamne amitsd@google.com
linux-stable-mirror@lists.linaro.org
-
Amit Sunil Dhamne via B4 Relay -
Heikki Krogerus -
kernel test robot