This is a note to let you know that I've just added the patch titled

hwmon: (pmbus/core) Prevent unintentional setting of page to 0xFF

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: hwmon-pmbus-core-prevent-unintentional-setting-of-page-to-0xff.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Wed Dec 6 18:04:41 CET 2017

From: "Edward A. James" eajames@us.ibm.com Date: Fri, 27 Oct 2017 11:55:05 -0500 Subject: hwmon: (pmbus/core) Prevent unintentional setting of page to 0xFF

From: "Edward A. James" eajames@us.ibm.com

[ Upstream commit 6dcf2fb5e8db3704f50af1f198256cb4e2453f8b ]

The pmbus core may call read/write word data functions with a page value of -1, intending to perform the operation without setting the page. However, the read/write word data functions accept only unsigned 8-bit page numbers, and therefore cannot check for negative page number to avoid setting the page. This results in setting the page number to 0xFF. This may result in errors or undefined behavior of some devices (specifically the ir35221, which allows the page to be set to 0xFF, but some subsequent operations to read registers may fail).

Switch the pmbus_set_page page parameter to an integer and perform the check for negative page there. Make read/write functions consistent in accepting an integer page number parameter.

Signed-off-by: Edward A. James eajames@us.ibm.com Fixes: cbcdec6202c9 ("hwmon: (pmbus): Access word data for STATUS_WORD") Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/hwmon/pmbus/pmbus.h | 6 +++--- drivers/hwmon/pmbus/pmbus_core.c | 25 +++++++++++-------------- 2 files changed, 14 insertions(+), 17 deletions(-)

--- a/drivers/hwmon/pmbus/pmbus.h +++ b/drivers/hwmon/pmbus/pmbus.h @@ -404,9 +404,9 @@ extern const struct regulator_ops pmbus_ /* Function declarations */

void pmbus_clear_cache(struct i2c_client *client); -int pmbus_set_page(struct i2c_client *client, u8 page); -int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg); -int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word); +int pmbus_set_page(struct i2c_client *client, int page); +int pmbus_read_word_data(struct i2c_client *client, int page, u8 reg); +int pmbus_write_word_data(struct i2c_client *client, int page, u8 reg, u16 word); int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg); int pmbus_write_byte(struct i2c_client *client, int page, u8 value); int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg, --- a/drivers/hwmon/pmbus/pmbus_core.c +++ b/drivers/hwmon/pmbus/pmbus_core.c @@ -136,13 +136,13 @@ void pmbus_clear_cache(struct i2c_client } EXPORT_SYMBOL_GPL(pmbus_clear_cache);

-int pmbus_set_page(struct i2c_client *client, u8 page) +int pmbus_set_page(struct i2c_client *client, int page) { struct pmbus_data *data = i2c_get_clientdata(client); int rv = 0; int newpage;

- if (page != data->currpage) { + if (page >= 0 && page != data->currpage) { rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page); newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE); if (newpage != page) @@ -158,11 +158,9 @@ int pmbus_write_byte(struct i2c_client * { int rv;

- if (page >= 0) { - rv = pmbus_set_page(client, page); - if (rv < 0) - return rv; - } + rv = pmbus_set_page(client, page); + if (rv < 0) + return rv;

return i2c_smbus_write_byte(client, value); } @@ -186,7 +184,8 @@ static int _pmbus_write_byte(struct i2c_ return pmbus_write_byte(client, page, value); }

-int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word) +int pmbus_write_word_data(struct i2c_client *client, int page, u8 reg, + u16 word) { int rv;

@@ -219,7 +218,7 @@ static int _pmbus_write_word_data(struct return pmbus_write_word_data(client, page, reg, word); }

-int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg) +int pmbus_read_word_data(struct i2c_client *client, int page, u8 reg) { int rv;

@@ -255,11 +254,9 @@ int pmbus_read_byte_data(struct i2c_clie { int rv;

- if (page >= 0) { - rv = pmbus_set_page(client, page); - if (rv < 0) - return rv; - } + rv = pmbus_set_page(client, page); + if (rv < 0) + return rv;

return i2c_smbus_read_byte_data(client, reg); }

Patches currently in stable-queue which might be from eajames@us.ibm.com are

queue-4.14/hwmon-pmbus-core-prevent-unintentional-setting-of-page-to-0xff.patch