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usb: typec: ucsi: Limit read size on v1.2 

Between UCSI 1.2 and UCSI 2.0, the size of the MESSAGE_IN region was
increased from 16 to 256. In order to avoid overflowing reads for older
systems, add a mechanism to use the read UCSI version to truncate read
sizes on UCSI v1.2.

Tested-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Prashant Malani <pmalani@chromium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Link: https://lore.kernel.org/r/20240209143723.v5.1.Iacf5570a66b82b73ef03daa6557e2fc0db10266a@changeid
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Abhishek Pandit-Subedi 2024-02-09 14:37:30 -08:00 committed by Greg Kroah-Hartman
parent 2a3b7af120
commit b3db266fb0
2 changed files with 35 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/usb/typec/ucsi/ucsi.c
View File

@ -36,6 +36,19 @@
*/
#define UCSI_SWAP_TIMEOUT_MS 5000
static int ucsi_read_message_in(struct ucsi *ucsi, void *buf,
size_t buf_size)
{
/*
* Below UCSI 2.0, MESSAGE_IN was limited to 16 bytes. Truncate the
* reads here.
*/
if (ucsi->version <= UCSI_VERSION_1_2)
buf_size = clamp(buf_size, 0, 16);
return ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, buf, buf_size);
}
static int ucsi_acknowledge_command(struct ucsi *ucsi)
{
u64 ctrl;
@ -72,7 +85,7 @@ static int ucsi_read_error(struct ucsi *ucsi)
if (ret < 0)
return ret;
ret = ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, &error, sizeof(error));
ret = ucsi_read_message_in(ucsi, &error, sizeof(error));
if (ret)
return ret;
@ -170,7 +183,7 @@ int ucsi_send_command(struct ucsi *ucsi, u64 command,
length = ret;
if (data) {
ret = ucsi->ops->read(ucsi, UCSI_MESSAGE_IN, data, size);
ret = ucsi_read_message_in(ucsi, data, size);
if (ret)
goto out;
}
@ -1558,6 +1571,15 @@ int ucsi_register(struct ucsi *ucsi)
if (!ucsi->version)
return -ENODEV;
/*
* Version format is JJ.M.N (JJ = Major version, M = Minor version,
* N = sub-minor version).
*/
dev_dbg(ucsi->dev, "Registered UCSI interface with version %x.%x.%x",
UCSI_BCD_GET_MAJOR(ucsi->version),
UCSI_BCD_GET_MINOR(ucsi->version),
UCSI_BCD_GET_SUBMINOR(ucsi->version));
queue_delayed_work(system_long_wq, &ucsi->work, 0);
ucsi_debugfs_register(ucsi);

11
drivers/usb/typec/ucsi/ucsi.h
View File

@ -23,6 +23,17 @@ struct dentry;
#define UCSI_CONTROL 8
#define UCSI_MESSAGE_IN 16
#define UCSI_MESSAGE_OUT 32
#define UCSIv2_MESSAGE_OUT 272
/* UCSI versions */
#define UCSI_VERSION_1_2 0x0120
#define UCSI_VERSION_2_0 0x0200
#define UCSI_VERSION_2_1 0x0210
#define UCSI_VERSION_3_0 0x0300
#define UCSI_BCD_GET_MAJOR(_v_) (((_v_) >> 8) & 0xFF)
#define UCSI_BCD_GET_MINOR(_v_) (((_v_) >> 4) & 0x0F)
#define UCSI_BCD_GET_SUBMINOR(_v_) ((_v_) & 0x0F)
/* Command Status and Connector Change Indication (CCI) bits */
#define UCSI_CCI_CONNECTOR(_c_) (((_c_) & GENMASK(7, 1)) >> 1)