From: Sanman Pradhan Date: Mon, 30 Mar 2026 15:56:40 +0000 (+0000) Subject: hwmon: (tps53679) Fix device ID comparison and printing in tps53676_identify() X-Git-Tag: v7.0-rc7~14^2~3 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=ca34ee6d0307a0b4e52c870dfc1bb8a3c3eb956e;p=thirdparty%2Fkernel%2Fstable.git hwmon: (tps53679) Fix device ID comparison and printing in tps53676_identify() tps53676_identify() uses strncmp() to compare the device ID buffer against a byte sequence containing embedded non-printable bytes (\x53\x67\x60). strncmp() is semantically wrong for binary data comparison; use memcmp() instead. Additionally, the buffer from i2c_smbus_read_block_data() is not NUL-terminated, so printing it with "%s" in the error path is undefined behavior and may read past the buffer. Use "%*ph" to hex-dump the actual bytes returned. Per the datasheet, the expected device ID is the 6-byte sequence 54 49 53 67 60 00 ("TI\x53\x67\x60\x00"), so compare all 6 bytes including the trailing NUL. Fixes: cb3d37b59012 ("hwmon: (pmbus/tps53679) Add support for TI TPS53676") Signed-off-by: Sanman Pradhan Link: https://lore.kernel.org/r/20260330155618.77403-1-sanman.pradhan@hpe.com Signed-off-by: Guenter Roeck --- diff --git a/drivers/hwmon/pmbus/tps53679.c b/drivers/hwmon/pmbus/tps53679.c index 3bca543817a6..249974c13aa3 100644 --- a/drivers/hwmon/pmbus/tps53679.c +++ b/drivers/hwmon/pmbus/tps53679.c @@ -175,8 +175,8 @@ static int tps53676_identify(struct i2c_client *client, ret = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf); if (ret < 0) return ret; - if (strncmp("TI\x53\x67\x60", buf, 5)) { - dev_err(&client->dev, "Unexpected device ID: %s\n", buf); + if (ret != 6 || memcmp(buf, "TI\x53\x67\x60\x00", 6)) { + dev_err(&client->dev, "Unexpected device ID: %*ph\n", ret, buf); return -ENODEV; }