diff options
| author | Amit Sunil Dhamne <amitsd@google.com> | 2025-05-03 02:57:03 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-05-21 14:04:34 +0300 |
| commit | 0736299d090f5c6a1032678705c4bc0a9511a3db (patch) | |
| tree | 9f3dfdad698a940eec80c305a41501ff06a7e56c | |
| parent | 85c4aa0a456409511f4383811a88a3cb6b3af75c (diff) | |
| download | linux-0736299d090f5c6a1032678705c4bc0a9511a3db.tar.xz | |
usb: typec: tcpm/tcpci_maxim: Fix bounds check in process_rx()
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>
Cc: stable <stable@kernel.org>
Link: https://lore.kernel.org/stable/20250502-b4-new-fix-pd-rx-count-v1-1-e5711ed09b3d%40google.com
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20250502-b4-new-fix-pd-rx-count-v1-1-e5711ed09b3d@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/typec/tcpm/tcpci_maxim_core.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/typec/tcpm/tcpci_maxim_core.c b/drivers/usb/typec/tcpm/tcpci_maxim_core.c index 29a4aa89d1a1..b5a5ed40faea 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; } |