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usb: typec: tcpm/tcpci_maxim: Fix bounds check in process_rx()

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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: 6f413b559f ("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>
This commit is contained in:
Amit Sunil Dhamne 2025-05-02 16:57:03 -07:00 committed by Greg Kroah-Hartman
parent 85c4aa0a45
commit 0736299d09
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/typec/tcpm/tcpci_maxim_core.c
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@ -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;
}